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 and 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.

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 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, 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 cannot 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.

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, your options are: commission a freelance technical designer (expect £150-£400 per style), use a manufacturer offering tech pack development as a paid service, or use a validated template with support from your pattern maker.

Do not guess. An incomplete tech pack produces an inaccurate sample, which produces a repeat sample round.

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, one of the most acute skills shortage areas in clothing manufacturing.

UKFT’s industry reporting identifies pattern cutting and grading among the top skills gaps in UK garment manufacturing, alongside machinist skills and technical design (Source: UKFT, Industry Reports and Statistics).

Pattern making has a direct relationship with sample quality. A pattern made by an experienced cutter who has worked extensively in your product category produces a first sample far closer to the approved spec than one made by a generalist 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.

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. 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, the grading brief should be explicit about the increment between sizes at each measurement point, whether the grade distributes proportionally or applies a flat increment, and whether the brand has a specific fit model to check 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 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.

For brands producing under 200 units per style, stock fabric from UK merchants is frequently the right sourcing route — not because it is 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.

Fabric Testing: What Must Be Done Before Cutting

Testing is not optional for compliant categories, and not optional for any brand intending to reorder the same fabric in future seasons.

Minimum required tests before bulk cutting: wash shrinkage, colourfastness, and pilling resistance, particularly 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.

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. Follow the approval sequence.

How Many Sample Rounds Should You Budget For?

Based on our own production data, brands without a complete tech pack typically need an average of 3-4 sample rounds across all sample types for a new style.

With a complete tech pack and clear approval criteria at each stage, we typically bring this down to 1-2 rounds for our clients (Source: Silk Routes production data, 2026).

The variables that most affect round count: completeness of the original tech pack, clarity of feedback at each approval stage, 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 begins creates waste, cost, and delay.

What Happens During Production

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

Cut: the approved pattern is used to cut fabric from the roll. Lay planning is performed before cutting to minimise waste, directly affecting cost per unit.

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

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

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: after main seaming, after pocket and trim attachment, and before pressing. This structure is named in our client SLAs.

Stage 7: Quality Control & Inspection

Quality control failures account for a meaningful share of avoidable production cost in UK garment manufacturing when rework, returns, and replacements are included — a cost that drops sharply once inline QC checkpoints are built into the production process rather than relying on end-of-line inspection alone (Source: Silk Routes production data, 2026).

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

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 are AQL 2.5 (general fashion quality) and AQL 1.0 (tighter standard for technical or compliance-driven categories).

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, the full batch is subject to 100% inspection or re-make.

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. We do not apply a uniform QC standard regardless of category — 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.

The most common finishing brief failure is not specifying embroidery placement precisely. “Left chest” is not a placement brief.

The distance from centre front, the distance from the shoulder seam, and the orientation of the design must all be specified.

We require a placement diagram in the tech pack for every embroidered or printed garment. 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.