Custom Fabric Sourcing: From Mill Selection to a Fabric You Can Repeat Next Season

A custom fabric is only useful if it can be bought again. Most development projects focus on getting the first lot right and treat the second season as a problem for later, which is how a signature quality becomes unobtainable twelve months after launch. The work that makes a fabric repeatable is a specification document rather than a technical breakthrough, and it is written during development rather than after it.

What does “custom fabric” actually mean?

Three levels, with very different costs.

Custom can mean a stock construction in your shade, a modified construction with your weight or finish, or a genuinely new fabric developed from the fibre up.

Buyers often ask for level three when level two would deliver what they need. Changing the weight or the finish of a construction the mill already runs usually gives a distinguishable fabric at a fraction of the development cost, and it inherits the mill’s existing quality control. Ask the mill or the factory which running qualities are closest to your intention and what a modification would involve, because the answer frequently removes the need for a full development project.

How should a mill be selected?

By what it already runs, not by what it says it can develop.

Mills specialise: some knit fine gauges, some work in specific fibre families, some are set up for small lots and others only run long ones.

The practical filter is to ask which qualities the mill produces continually and in what quantities, then evaluate your project against that list. A mill that runs your fibre family every week has the yarn relationships, the dyehouse connections and the process control already in place; one that would develop the fabric for you is learning as it goes. Ask which of your requirements are standard and which would be new, and ask for the reference of a similar quality it currently produces. A mill that can point to a comparable fabric is describing a capability rather than an ambition.

What does the development sequence look like?

Swatch, lab dip, bulk sample, then bulk.

Each stage increases the quantity and the commitment, and each answers a question the previous stage could not.

The swatch confirms the construction and the hand, the lab dip confirms the shade against your standard, the bulk sample confirms that the production equipment reproduces both, and the bulk lot confirms the mill can repeat it. Ask what each stage costs, how long it takes and what quantity it produces, because the schedule and the budget both depend on that structure. Where a mill proposes to skip the bulk sample, that is a signal to ask how it verifies that a laboratory result transfers to production, since the two frequently differ on knitted fabrics.

How do mill minimums work?

By colour and by run length.

A mill typically sells by a minimum run length, and each colour adds its own dyeing minimum on top of the greige fabric quantity.

That structure is why fabric minimums rather than garment minimums often control a first collection. Ask for the run length required for the quality and the dyeing minimum per colour, then calculate how much fabric your intended garment order consumes and how much would remain. Where the garment order is smaller than the fabric minimum, the options are to use a stocked quality, to accept the minimum and hold the balance for a reorder, or to combine colours within one dyeing schedule if the mill will allow it. Each has a different cash consequence, and they should be compared before the fabric is ordered rather than after.

What does development cost consist of?

Sampling, tooling and the minimum commitment.

Beyond the swatches and lab dips, development involves a knitting trial, dyeing trials and testing, and the cost of each is usually recovered either as a charge or through the minimum order.

Ask for the development cost to be itemised, because a single figure conceals whether the money is going into sampling, into testing or into the minimum commitment. Where a mill recovers development through a higher first-lot price, the effective cost is spread across the order, which is preferable if the fabric repeats and expensive if it does not. That comparison is worth making explicitly, since the same total can be structured either as a one-off charge or as a price premium, and the two behave very differently on the second order.

Which tests should a developed fabric pass?

Shrinkage, colourfastness, hand and structure.

A new fabric should be tested for how it behaves after washing as well as how it looks before, because the second is what the customer experiences.

Shrinkage determines whether the size chart survives the first wash; colourfastness determines whether the shade holds; hand determines whether the garment still feels like the sample; and the structure determines whether the weight and the recovery are what was specified. Ask which tests the mill runs and on what sample size, then request the figures in writing. Where a mill does not test a property you depend on, the test can be commissioned separately, and doing so before the bulk order is cheaper than discovering a shortfall after the garments are cut.

What makes a fabric repeatable?

Five items, written down.

Each prevents a specific kind of drift on the next order: a weight that creeps, a structure that changes, a finish that disappears, a shade that moves or a yarn that is quietly substituted.

• The composition, weight and gauge, stated as numbers rather than descriptions.
• The structure, named as the mill names it internally.
• The finish and its application stage.
• The shade standard, retained physically by the mill and by the brand.
• The yarn source and the dyehouse used for the approved lot.

The drift these prevent is gradual: a weight that creeps, a structure that changes, a finish that disappears, a shade that moves and a yarn that is substituted. Ask for the specification in the mill’s own terms and keep a copy, because the version that matters at the next order is the one the brand holds. Where a mill retains a standard, ask how long it is kept and what happens if the yarn is discontinued, since both affect whether the fabric is genuinely repeatable.

Should a first collection use stock or custom fabric?

Stock, unless the fabric is the product.

A running quality removes the development cost, the minimum commitment and the schedule risk, at the price of exclusivity.

For most first collections the sensible sequence is to launch on a stock quality, validate the garment and the demand, then develop a proprietary fabric once the style has earned the investment. That order also protects the reorder, because the running quality remains available while the new fabric is developed. Where the fabric is genuinely the product — a specific hand, a performance property or a construction no one else runs — development belongs in the first order, and the schedule and minimum should be planned accordingly.

How should risk be allocated between brand, agent and mill?

By writing down who carries each failure.

Where an agent sources the fabric, the responsibility for a quality failure, a shade deviation or a late delivery sits somewhere between three parties unless it is assigned.

Ask who inspects the fabric before cutting, who accepts or rejects a lot that is out of tolerance, and what happens if a bulk lot differs from the approved sample. Those three questions cover most of the disputes that arise. Where the brand buys directly from a mill, it carries the inspection responsibility and should plan to test the lot before cutting. Where the factory buys, the responsibility usually sits with the factory, and the price reflects it. Being explicit about the position before the order is placed removes the ambiguity that turns a quality issue into a negotiation.

How should the fabric be handed to the garment factory?

With the specification, the standard and a retained sample.

The garment factory needs enough information to cut and sew without substituting, and the brand needs confirmation of what it will receive.

Provide the composition, weight, gauge, finish and shade standard, together with a retained sample of the approved lot, and ask the factory to confirm in writing which quality it will use. Where the fabric is supplied by the brand, the purchase order should state that production is contingent on the lot meeting the specification, and who inspects it. Where the factory supplies it, the specification should name the mill and the quality reference so the substitute cannot be an approximation. Both arrangements work; the failure mode is an undocumented one.

Sources: Supima — extra-long staple cotton; Textile Exchange standards; OEKO-TEX STANDARD 100; ZDHC Roadmap to Zero; ISO 9001 quality management.