A custom fabric is the strongest moat an activewear brand can own — and the easiest way to burn a season. This guide shows the three routes to an exclusive hand, the eight stages a mill actually runs, and the numbers that decide whether custom is worth it for your programme.
Library base + library colour, library base + custom colour, or a fully custom construction. Most brands need the middle one.
Custom fabric development or dyeing typically adds ~15–20 days before garment production starts.
Custom fabric MCQ is typically ~500–1,300 m per mill, colour and construction — usually the binding constraint, not garment MOQ.
Fabric is approved on the garment it is for — proto, fit and wash — not on a swatch card.
Three routes to an exclusive hand
“Custom fabric” means three very different projects. Mixing them up is the most common reason a development budget overruns.
| Route | What changes | What stays fixed | When it fits |
|---|---|---|---|
| A · Library base, library colour | Nothing on the fabric — your pattern, trims and branding make it yours | Construction, yarn, finish, colour card | First collection, test SKUs, fast sell-through checks |
| B · Library base, custom colour | Colour (lab dip to your standard), sometimes finish or print | Construction and yarn — the hand you already approved | Brand colour story on a proven hand; the most common route |
| C · Custom construction | Yarn, gauge, knit structure, weight, finish — a new fabric code | Only your brief | A hero product whose hand must not exist on Alibaba |
Route B buys you 80% of the brand value of route C for a fraction of the risk: the hand, recovery and opacity are already proven, and only colour has to pass. Route C is justified when the feel is the product — a sculpting double knit, a cool-touch second skin, a matte compression face nobody else sells.
The eight-stage development path
Every serious mill runs some version of this sequence. Knowing it lets you ask where your project is — and spot a supplier that is skipping steps.
- Brief and benchmark. End use, target hand, weight band, stretch and opacity expectations, colour standards, claims (recycled, UPF) and a reference garment or swatch. A benchmark you can hand over beats ten adjectives.
- Construction proposal. Yarn type and count (e.g. nylon 66 vs nylon 6 filament, elastane denier and percentage), machine gauge and knit structure (single jersey, interlock, double knit, warp knit). This is where the hand is really decided.
- Greige trial. A short knitting run in undyed (greige) state to check weight, width, stretch and surface before money is spent on dyeing.
- Dyeing and finishing trial. Heat-setting, dyeing and finishing (brushing, peach, wicking or soft finishes) move weight, width and stretch. A greige pass is not a finished pass.
- Lab dips. Colour submitted against your physical standard under the agreed light source; approved, adjusted, or re-dipped. Plan at least one correction round for difficult shades.
- Fabric testing. The test plan below, run on finished fabric — in-house screening first, third-party lab where a claim or a retailer requires it.
- Garment proto on development fabric. The fabric is cut into the actual style. Recovery, opacity and seam behaviour are judged on a body, then after washing.
- PPS and bulk booking. Pre-production sample on bulk-intent fabric, then yarn and greige are booked against your bulk quantity.
The step most often skipped is 7. A fabric can pass every lab test and still fail on a squatting body, because the seat of a legging stretches far more than a lab strip does. See how we evaluate squat-proof fabrics.
What a fabric brief must contain
A mill can only quote and develop against what is written. These eight lines prevent most re-dips and re-knits:
- End use and garment (e.g. high-waist legging, 25" inseam, studio + gym)
- Reference: physical swatch or garment, plus what to keep and what to change
- Weight band (g/m²) and composition intent (e.g. nylon/elastane, recycled content Y/N)
- Stretch and recovery expectation, and the method you will test with
- Opacity requirement, lightest colour, and whether it must pass after washing
- Colour standards (physical), light source, and tolerance
- Claims you intend to print (UPF, recycled, quick-dry) and the paperwork each needs
- Target bulk quantity per colour, so the mill can size the minimum
Use the tech pack guide for the garment side. If you only have a competitor garment, send it — reverse-engineering composition and construction is a normal first step.
A test plan by end use
Test what the garment will be blamed for. The same fabric needs a different plan as a legging, a swimsuit or a hoodie.
| End use | Tests that decide approval | Deep-dive guide |
|---|---|---|
| Leggings, bras | Stretch and recovery (cyclic), opacity under stretch, pilling, colourfastness to rubbing and perspiration | Stretch recovery · Squat-proof |
| Swimwear | Colourfastness to chlorinated and sea water, elastane retention after chlorine, UPF, light fastness | Chlorine testing |
| Tennis, padel | Recovery, opacity in white and light colours, moisture management, abrasion and snagging | Tennis & padel fabrics |
| Knit lounge | Pilling, dimensional stability, spirality, colourfastness to washing | Pilling & shrinkage |
MCQ, lead time and cost — the numbers that decide
Minimums. Custom fabric is governed by the mill’s minimum colour quantity (MCQ), typically ~500–1,300 m depending on mill, colour and construction. That is why a brand can have a low garment MOQ and still face a fabric minimum that is the real gate. The full arithmetic is in stock vs custom fabric: MOQ and lead times.
Time. Custom fabric development or custom dyeing typically adds ~15–20 days before garment production. Bulk garment production then runs on the usual clock — about 25–30 days after PPS on stocked bases, longer for swimwear and specialised constructions.
Cost drivers. Yarn type (nylon 66 and branded elastane cost more than commodity nylon 6), elastane percentage, gauge, finishing steps, and the number of colours. Development charges, where they apply, are quoted against the written brief — never as a rate card.
Exclusivity, IP and sustainability claims
A custom construction gets its own development code (for example ZS-ACT-250N66, a nylon 66 performance double knit). Exclusivity terms — which colours, which period, which markets — are written into the agreement, ideally under a mutual NDA signed before the brief is shared.
Recycled claims need paperwork per order. GRS-certified options are available subject to the selected mill, material scope and transaction certificate requirements; ZIESHINE’s own licence scope is stated on the certifications page. A swatch labelled “recycled” is not a claim you can print.
We publish named-base compositions, weights and the lab summaries we hold (for example the AquaForm™ Intertek summary on the fabric test pack). We do not publish a universal “development fee”, a fabric price list or test results for fabrics that have not been tested — those are quoted or reported per brief.
When custom is not worth it
- Your first collection has no sell-through data yet — launch on a library base, then customise the proven SKU.
- Your quantity per colour is far below the mill minimum and you cannot share fabric across styles.
- The difference you want is colour only — that is route B, not route C.
- Your launch date leaves no room for a greige trial, dye trial and garment proto.
When it is worth it, start with the commercial desk: sportswear fabric development.
Methods and sources cited
- ISO 20932-1 / EN 14704-1 (elasticity of fabrics)
- ISO 105 series (colourfastness)
- ISO 12945-2 (pilling, modified Martindale)
- ISO 6330 + ISO 5077 (washing and dimensional change)
Standards are named as the methods buyers commonly specify. Factory results are only those stated as on file; programme results are reported per brief.