Introduction: The Stage Most Brands Skip That Costs Them the Most

Brands come to us every week without a tech pack.

They have a sketch, a reference garment, sometimes a detailed mood board. What they do not have is the one document that tells a factory — any factory — exactly what to make. And without it, the first four to six weeks of the manufacturing relationship are spent filling in information gaps that should have been resolved before the first conversation.

That time costs money. It delays your season. And it is entirely avoidable.

The clothing manufacturing process has eight distinct stages, from design development through to finishing and dispatch. Each stage has inputs it needs to receive and outputs it must deliver before the next stage can begin. A break in that chain — an incomplete tech pack, an unapproved sample, a fabric that has not been tested — creates a knock-on delay that compounds at every subsequent stage.

This guide walks through every stage of the process in the order it actually happens. Not the simplified version. The real one, with the decisions, the trade-offs, and the specific mistakes that cause brands to lose weeks and money at each point.

QUICK ANSWER

The clothing manufacturing process runs across 8 stages: design development, tech pack creation, pattern making and grading, fabric sourcing and testing, sample development, production run, quality control, and finishing. From an approved tech pack to finished bulk goods, UK manufacturing typically takes 8–14 weeks depending on product complexity. A complete, accurate tech pack reduces sampling rounds from an industry average of 3.2 to 1.4 and cuts overall development time by 35–40%. Getting the pre-production documentation right is the single highest-return investment a brand can make before approaching any manufacturer. (Source: UKFT Production Survey, 2024.)

Stage 1: Design Development

The UK fashion and textile industry contributes £62 billion to GDP and supports 1.3 million jobs — yet the single most common failure point we see at production stage originates here, in design development. (Source: UKFT / Oxford Economics, Fashion & Textile Industry Footprint Report, 2023.)

Design development is not drawing. It is the process of translating a creative concept into a manufacturable specification.

Those are different things. A concept can ignore construction reality — a spec cannot.

The practitioner view: We see two categories of brief arrive at Silk Routes. The first is a concept — visuals, references, a general aesthetic direction. The second is a specification — construction method, fabric weight, seam type, finish. The first requires a development conversation before sampling can begin. The second can go to pattern directly. The difference in timeline between the two is typically three to four weeks.

If you are at concept stage, the most valuable thing you can do before approaching a manufacturer is answer these four questions in writing: What is the garment’s primary end use? What fabric type and weight does the construction require? What is the target retail price point, and does the specification support the margin at your likely MOQ? What certifications or compliance standards does the product need to meet?

What Good Design Development Produces

A completed design development stage should produce: a finalised silhouette with construction notes, a fabric brief (not a final fabric selection — that comes later), a trim and hardware list, a colourway plan, and a target cost range.

It should not produce a finished product. That comes through sampling. Design development is the foundation; sampling is the refinement.

Stage 2: Tech Pack Creation

The tech pack is the legal and operational document of clothing manufacturing. Every factory that has ever produced a consistent garment has worked from one.

A tech pack is not optional. It is not something that can be replaced by a sample garment, a Pinterest board, or a detailed email. It is the single source of truth for the manufacturer — and the single point of reference if a production run comes back wrong.

What a Complete Tech Pack Contains

The practitioner view: The most common tech pack failure we see is incomplete measurement specifications. A brand provides measurements for the sample size only and assumes the factory will grade the range. Grading to a brand’s fit standard requires the brand’s grading rules — assumptions made by the factory will produce a size run that fits inconsistently. Provide a full graded spec for every size in your range, or brief the factory explicitly to grade and submit the graded spec for approval before cutting.

How to Create a Tech Pack If You Do Not Have One

You do not need specialist software. Adobe Illustrator is industry standard for technical flats. If you are not a trained technical designer, the options are: commission a freelance technical designer (expect £150–£400 per style), use a manufacturer that offers tech pack development as a paid service (Silk Routes offers this), or use a validated template and complete it yourself with support from your pattern maker.

Do not guess. An incomplete tech pack produces an inaccurate sample. An inaccurate sample produces a repeat sample round. Every repeat sample round costs you time and money that a complete tech pack would have avoided.

Working with Silk Routes on your tech pack? Our team reviews every brief before sampling begins. See our full manufacturing services to understand how we approach pre-production documentation.

Stage 3: Pattern Making & Grading

Pattern making translates the tech pack specification into the physical cutting templates used to produce the garment. It is a skilled trade. And in the UK, it is one of the most acute skills shortage areas in clothing manufacturing.

The UKFT’s Facts and Figures 2024 report identifies pattern cutting and grading as among the top three skills gaps in UK garment manufacturing, alongside machinist skills and technical design. (Source: UKFT, Facts and Figures 2024. https://ukft.org/facts-and-figures24/)

The practitioner view: Pattern making has a direct relationship with sample quality. A pattern made by an experienced cutter who has worked extensively in your product category will produce a first sample that is far closer to the approved spec than one made by a generalist cutter encountering your construction for the first time. When we take on a new product category at Silk Routes, we assign the pattern to the cutter with the most relevant category experience — not simply the next available person. That decision alone reduces first-sample rejection rates significantly.

Grading: What It Is and Why It Is Not Automatic

Grading is the process of scaling a base-size pattern up and down to produce the full size range. It is not a simple multiplication. Grading rules vary by garment type, brand fit standard, and target customer — and applying incorrect grading rules produces a size run that fits well at the sample size and poorly at every other size.

For brands launching with a limited size range (XS–L, or UK 8–16), the grading brief should be explicit about: the increment between sizes at each measurement point, whether the grade distributes proportionally across chest / waist / hip or applies a flat increment, and whether the brand has a specific fit model or measurement standard the grade must be checked against.

Grading that has not been explicitly briefed will default to the factory’s standard increments. Those increments may or may not match your customer’s body.

Stage 4: Fabric Sourcing & Testing

Fabric sourcing is not buying fabric. It is identifying, qualifying, and securing the right material at the right specification before production begins.

The distinction matters because the most common sourcing mistake — choosing a fabric based on a small swatch — produces a garment in bulk that behaves differently to the development sample. Fabric weight, hand feel, and drape at a 20cm swatch are not the same as fabric behaviour at a full garment cut and washed.

The Fabric Sourcing Decision [TABLE]

The practitioner view: For brands producing under 200 units per style, stock fabric from UK merchants is frequently the right sourcing route — not because it is the cheapest, but because the lead time and MOQ flexibility allow development and bulk production to run closer together. The per-metre cost premium over direct mill sourcing is often offset by the reduction in working capital tied up in minimum quantities you may not need. We discuss sourcing routes with every client before the fabric brief is confirmed.

Fabric Testing: What Must Be Done Before Cutting

Testing is not optional for compliant categories. It is not optional for any brand that intends to reorder the same fabric in future seasons.

Minimum required tests before bulk cutting: wash shrinkage (to confirm the pattern accounts for post-wash dimensions), colourfastness (to confirm colour stability under washing and perspiration conditions), and pilling resistance (particularly relevant for knitwear and jersey fabrics).

For GOTS-certified organic fabric claims, the certification must be verified through the GOTS public database before the claim is used in brand communications. For OEKO-TEX Standard 100 fabric, the certificate must be current — certificates are valid for one year and must be renewed by the mill.

Stage 5: Sample Development — Proto to Production

The sample development stage is where most development budget is spent and most time is lost. Understanding which sample type serves which purpose prevents brands from requesting unnecessary rounds or approving at the wrong stage.

The practitioner view: The most expensive sampling mistake we see consistently is brands approving a proto sample on construction and proportion, then requesting fabric and colour changes at PP stage. Proto is for construction. SMS is for fit. PP is for fabric, colour, and trim confirmation in the production fabric. Requesting a fabric change after PP approval triggers a new PP round — adding 2–4 weeks and a full additional sample cost. The approval sequence exists for a reason. Follow it.

How Many Sample Rounds Should You Budget For?

Industry average is 3.2 rounds across all sample types for a new style. (Source: UKFT Production Survey, 2024.) With a complete tech pack and clear approval criteria at each stage, we typically bring this to 1.4–1.8 rounds for our clients.

The variables that most affect round count: completeness of the original tech pack, clarity of feedback at each approval stage (specific, technical feedback versus general aesthetic opinions), and whether the brand has worked with the factory on a similar construction before.

Stage 6: Production Run

The production run begins only when the PP sample has been approved in writing. Not verbally. Not by email with caveats. In writing, unambiguously, by the authorised person on the brand side.

An unambiguous PP approval is the factory’s authority to cut bulk fabric. Any change requested after bulk cutting has begun creates waste, cost, and delay. The discipline of a clean PP approval is one of the most valuable habits a brand can develop.

What Happens During Production

A production run has three phases: cut, make, trim (CMT). These are distinct operations, often performed by different teams within the same factory.

Cut: The approved pattern is used to cut fabric from the roll. Lay planning (arranging pattern pieces on the fabric to minimise waste) is performed before cutting. Fabric utilisation efficiency at this stage directly affects cost per unit.

Make: The cut pieces are assembled by machinists. Stitch type, stitch density, seam allowance, and pressing at each stage are performed to the spec defined in the tech pack. Inline QC checks are conducted during make — not only at end of line.

Trim: Finishing operations — thread trimming, pressing, attaching labels, care labels, hangtags, packaging. This is the stage that determines how the finished garment is presented to the end customer.

The practitioner view: Inline QC during make is non-negotiable at Silk Routes. Catching a construction error at stitch stage costs the time to re-stitch one seam. Catching the same error at end-of-line QC means a full inspection and potential re-make of multiple units. We run inline checks at three points in the make sequence: after the main seaming, after pocket and trim attachment, and before pressing. This structure is named in our client SLAs so brands know exactly how quality is managed during production — not just at the end.

Stage 7: Quality Control & Inspection

Quality control failures account for an estimated 12–18% of production costs in UK garment manufacturing when rework, returns, and replacements are included. (Source: WRAP, Textiles 2030 Progress Report, 2024. https://www.wrap.ngo/resources/report/textiles-2030-progress-report)

QC is not a final check. It is a system built into every stage of production.

The Four QC Checkpoints

AQL Sampling: What the Numbers Mean

AQL (Acceptable Quality Level) is the standard method for statistically sampling a production batch without inspecting every unit. The most commonly used levels in garment manufacturing are AQL 2.5 (general quality for fashion) and AQL 1.0 (tighter standard for technical or compliance-driven categories like workwear and childrenswear).

At AQL 2.5, a batch of 500 units requires inspection of 50 units. If 3 or fewer major defects are found, the batch passes. If 4 or more are found, the full batch is subject to 100% inspection or re-make.

The practitioner view: We use AQL 2.5 as our standard level for fashion garments. For uniform programmes and childrenswear, we apply AQL 1.0. The decision is made at pre-production stage and written into the production brief — brands are told which level applies to their order before production begins. We do not apply a uniform QC standard to every order regardless of category, because a children’s garment and a fashion tote bag do not carry the same risk profile if a defect is missed.

Stage 8: Finishing Services — Embroidery, Printing & Packaging

Finishing is the stage that most directly affects the brand experience of the finished garment. It is also the stage most frequently under-briefed.

Decoration Methods Compared

The practitioner view: The most common finishing brief failure is not specifying embroidery placement precisely. “Left chest” is not a placement brief. The distance from the centre front, the distance from the shoulder seam, and the orientation of the design (does it run parallel to the collar or parallel to the hem?) must all be specified. We require a placement diagram in the tech pack for every embroidered or printed garment — not just a note. A placement diagram takes ten minutes to produce and prevents a decoration that cannot be unpicked.

Timeline: Concept to Delivery 

Cost Breakdown by Production Stage

These figures represent UK market ranges in 2026. They are starting benchmarks — actual quotes vary by manufacturer, volume, and specification. Use them to sense-check quotes, not to fix expectations before briefing.

Common Production Mistakes 

Mistake 1: Starting Sampling Without an Approved Tech Pack

Why it happens: Brands are eager to see a physical sample and believe the factory can interpret their intent from a reference garment or sketch. Exact fix: Do not submit a sampling brief without a complete tech pack. If you do not have one, invest in tech pack development first. The cost of one extra sample round (typically £150–£300) exceeds the cost of producing a basic tech pack. The factory cannot make what has not been specified — it can only make its best interpretation, which will require correction.

Mistake 2: Approving Samples Without Written Sign-Off

Why it happens: Brand teams communicate approval verbally or via WhatsApp message without a formal written record of what was approved and what conditions were attached. Exact fix: Use a sample approval form for every sample stage. It should record: sample type, date received, decision (approved / approved with amendments / rejected), specific amendments required, person authorising, and date of sign-off. Keep this on file. If a bulk production dispute arises, the sample approval record is the primary reference document.

Mistake 3: Changing Fabric at PP Stage

Why it happens: The brand sees the PP sample in the production fabric and decides a different fabric would look better — a decision that should have been made at fit stage. Exact fix: Confirm fabric selection definitively at SMS (fit sample) stage. PP stage is for confirming the approved fabric in bulk — not for exploring alternatives. Fabric changes after PP require a new PP round. Build a fabric sign-off step into your approval process explicitly, before PP is ordered.

Mistake 4: Sending Vague Correction Notes

Why it happens: Brand stakeholders who are not technically trained describe problems aesthetically rather than technically — “the shoulder looks wrong” rather than “reduce shoulder seam by 1cm at armscye.” Exact fix: Train anyone who reviews samples to measure before they describe. A caliper and a tape measure at every sample review prevents 80% of ambiguous correction notes. If you do not know the technical language, measure the difference between what you received and what you wanted, and express it in millimetres or centimetres. The factory works in measurements — not in aesthetic descriptions.

Mistake 5: Not Building PP Approval Time Into the Season Calendar

Why it happens: Brands build a production calendar that assumes one sample round and immediate PP approval. Real development involves iteration, courier time, and internal approval processes. Exact fix: Add three weeks of buffer to every pre-production stage in your calendar. One week for courier transit (both directions). One week for internal review and decision-making. One week contingency for a correction round. If you do not need the buffer, your season lands early. If you do need it, you are not renegotiating delivery dates with buyers.

Mistake 6: Skipping Third-Party Final Inspection

Why it happens: Brands trust the factory’s own QC and skip the cost of an independent inspection to save £200–£400. Exact fix: Commission an independent AQL inspection for every bulk order over 200 units. The cost of a single batch recall, customer return programme, or retailer deduction for defective goods exceeds the inspection cost by a factor of 10–50. Independent inspection is insurance. It also builds trust with retail buyers who increasingly require inspection reports as part of supplier onboarding. (Source: OPSS, Product Safety Advice for Businesses. https://www.gov.uk/guidance/product-safety-advice-for-businesses)

CASE STUDY 1: The Tech Pack That Saved Four Weeks

A London-based accessories and jersey brand came to us with a new range — five styles, all jersey construction, targeting a spring launch with a confirmed retail listing.

Their timeline required a PP approval within eight weeks of brief submission. The first two styles arrived with complete tech packs — construction drawings, full graded specs, Pantone colourway references, care label text. Proto samples on both styles were approved after one round. Pattern was confirmed. PP was ordered immediately.

The remaining three styles arrived without graded specs. The brand had provided sample size measurements only and noted “please grade to standard.” Our pattern cutter flagged this before sampling began and requested the grading instructions. The brand needed two weeks to confirm their grading standard with their technical designer.

Result: the two fully-specified styles completed PP approval in seven weeks. The three under-specified styles completed PP approval in eleven weeks — four weeks longer, entirely attributable to the missing grading brief.

The brand has since adopted a pre-submission tech pack checklist for every style. Their average development time on new styles has reduced by 28% across the following two seasons.

CASE STUDY 2: The Inline QC That Prevented a Full Re-Make

A Manchester-based workwear brand — 800-unit production run, a corporate jacket with embroidered chest logo and reflective tape panels.

At the second inline QC checkpoint (after trim attachment), our floor QC identified that the reflective tape on 34 units had been applied 8mm outside the specified placement — a positioning error introduced when the trim team changed shift midway through the run.

At that point, 34 units were affected. The correction — removing and re-applying the reflective tape — took half a day on those 34 units.

Without inline QC, the error would not have been caught until end-of-line inspection — at which point 200+ units would have been affected before the shift change was identified. The re-make cost on 200 units at the garment’s CMT rate would have been approximately £4,200 — against a QC intervention cost of under £200.

The client received their full 800-unit run on schedule. The inline QC checkpoint that caught the error is standard practice in our production process, not an add-on.

The Silk Routes Approach to Production Management

We manage the full eight-stage process described in this guide — from tech pack review through to final inspection and dispatch. Our clients are not handed off to a production team after the initial conversation. The same person who reviews your brief is accountable for the production outcome.

Our pre-production process starts with a brief assessment before any costs are committed. We review your tech pack against our production checklist — 24 specification points across construction, fabric, trim, and compliance — and return a written brief assessment within three working days. If your brief has gaps, we tell you specifically what is missing and what it will take to resolve them. We do not start the clock on sampling until we are confident the brief is complete enough to produce an accurate first sample.

For brands that need tech pack development support, we offer this as a paid pre-production service. For brands that arrive with complete documentation, we proceed directly to pattern and sampling. We do not charge a development fee for brands providing a complete tech pack.

What we can guarantee: a written brief assessment before sampling begins, inline QC at three production checkpoints, and a final inspection report before dispatch. What we cannot guarantee: a specific number of sample rounds — that depends on the accuracy of the original brief and the speed of the brand’s approval process. We will tell you our honest estimate based on the brief we receive.

For brands at the start of their manufacturing journey, our clothing manufacturing services page covers what we produce and how the process works in practice. For questions about a specific brief, contact us directly — we review every enquiry and respond within two working days.

Our approach to production is built around the same values that underpin our ethical manufacturing standards — transparent process, honest timelines, and no commitment to outcomes we cannot deliver.

This guide pairs directly with our Complete Guide to Clothing Manufacturers UK — which covers the broader landscape of manufacturer selection — and with our Low MOQ & Private Label guide for brands at startup or early scaling stage.

You can read more about how we work and the team behind Silk Routes on our about page.

FAQ

How long does the full clothing manufacturing process take from concept to delivery?

From an initial concept brief to finished bulk delivery, the realistic timeline is 14–22 weeks for a new style with a new manufacturer. From an approved PP sample — which assumes design development and sampling are complete — bulk production and dispatch typically runs 8–12 weeks depending on product complexity and volume. Brands that build a 14-week minimum into their season calendar from concept to delivery date avoid the majority of timeline pressure. The most common planning error is assuming the process starts at bulk cut rather than at design development.

What is the minimum information a factory needs to start sampling?

The minimum viable brief for a first proto sample is: a technical flat sketch with construction notes, a measurement specification for at least the base sample size, a fabric brief (type, weight, composition), a colourway specification, and a trim list. Without all five of these, the factory will make assumptions that will require correction — adding at least one additional sample round. A complete graded spec, care label text, and packaging brief should follow before the PP sample is ordered.

How much should I budget for sample development on a new style?

Budget £400–£900 per style for full sample development from proto through to PP, assuming two rounds per sample type at the higher end. This covers: proto sample (1–2 rounds at £80–£250/round), fit sample (1–2 rounds at £80–£200/round), and PP sample (1 round at £100–£300). Pattern making adds £80–£250 per style. Tech pack development, if outsourced, adds £150–£400. A realistic all-in pre-production budget for a new style with no existing patterns is £600–£1,500 before bulk fabric and CMT costs are considered.

What is AQL inspection and do I need it for every order?

AQL (Acceptable Quality Level) is a statistical sampling method that allows a batch to be assessed for defect rate without inspecting every unit. AQL 2.5 is the standard level for fashion garments; AQL 1.0 is used for higher-risk categories including childrenswear and technical workwear. For orders under 100 units, 100% inspection by the factory QC team is typically sufficient. For orders of 200 units or more, an independent AQL inspection — conducted by a third-party inspector before packing — provides an objective quality record and is increasingly required by retail buyers as part of supplier compliance documentation.

What is the difference between inline QC and final inspection?

Inline QC is conducted during production at specific checkpoints — typically after main seaming, after trim attachment, and before pressing. Its purpose is to catch construction errors early, when they affect a small number of units and can be corrected cheaply. Final inspection is conducted after production is complete and before packing. It uses AQL sampling to assess the finished batch against the approved PP sample. Both are necessary — inline QC prevents defects from propagating; final inspection provides the formal quality record. A factory that offers only final inspection with no inline QC process is a higher-risk production environment.

Can I visit the factory during production?

Yes — and for orders over 500 units or for brands placing their first order with a new manufacturer, we encourage a factory visit at two points: once during pattern and pre-production stage to align on construction details, and once during bulk production at the inline QC checkpoint. Silk Routes clients are welcome to visit our production facility in the UK at either stage by appointment. Remote video inspection is also available for clients who cannot travel. Factory visits consistently reduce the number of correction rounds and build the working relationship that leads to better outcomes on repeat orders.

Citations and Sources

[1]. UKFT / Oxford Economics — Fashion & Textile Industry’s Footprint in the UK.
https://ukft.org/industry-footprint-report/

[2]. UKFT — Industry Reports and Statistics.
https://ukft.org/industry-reports-and-stats/

[3]. UKFT — Industry Reports and Statistics.
https://ukft.org/industry-reports-and-stats/

[4]. WRAP — UK Textiles Pact Annual Progress Report 2023–24.
https://www.wrap.ngo/resources/report/uk-textiles-pact-annual-progress-report-2023-24

[5]. OPSS / Gov.uk — Product Safety Advice for Businesses.
https://www.gov.uk/guidance/product-safety-advice-for-businesses

[6]. Gov.uk — Check Your Goods Meet the Rules of Origin.
https://www.gov.uk/guidance/check-your-goods-meet-the-rules-of-origin

[7]. Textile Exchange — Materials Market Report 2024.
https://textileexchange.org/knowledge-center/reports/materials-market-report-2024/

[8]. Make It British — UK Clothing Manufacturers Directory 2025.
https://makeitbritish.co.uk/uk-manufacturers-guide