Working with a Fabric Mill vs a Garment Factory
At some point every growing activewear brand asks whether it should buy fabric itself and send it to the factory. The honest answer is that it depends on what you are optimising for. Buying direct gives you control over composition, price transparency and repeatability. Buying through the factory gives you one accountable party, faster sampling and no inbound freight coordination. The mistake is choosing one without deciding who carries the risk when the fabric fails a test.
What Each Party Controls
The mill controls fibre selection, knit construction, finishing, GSM, width, and the stretch and recovery characteristics of the cloth. The garment factory controls marker efficiency, cutting accuracy, sewing parameters, and how the fabric behaves under needle and thread. Neither can fully control the outcome of the other, which is why a shrinkage or seam-slippage problem often turns into a dispute about whose fault it is.
Why the Mill Relationship Matters for Stretch Knits
A medium impact bra depends on four-way stretch with reliable recovery. That is set at the mill, not at the sewing machine: elastane content, elastane denier, stitch length and heat-setting conditions all determine whether the band returns to shape after extension. If you specify only composition and GSM, you have specified almost nothing that matters.
Ask the mill for stretch percentage, growth percentage after a defined extension and hold time, and recovery after washing. Require dimensional change testing to AATCC 135 or the ISO 6330 equivalent, and colour fastness to washing and perspiration under the ISO 105 series. These are the numbers that predict how the finished bra will perform.
Three Sourcing Models
Factory-nominated mill: the factory selects and buys the fabric. Fastest and simplest, and the factory carries fabric risk, but you have limited visibility on cost and no guarantee of continuity if the factory switches mills.
Buyer-nominated mill: you approve the mill and the fabric spec, the factory buys it. You gain control and visibility while the factory still manages the commercial relationship and inbound logistics.
Mill-direct with factory CMT: you buy the fabric and deliver it to the factory, which charges cut-make-trim only. Maximum control and lowest unit cost at scale, but you now own fabric risk, freight, customs and any shortfall from cutting waste.
Closing the Quality Responsibility Gap
Whichever model you choose, write down who tests what and who pays for failure. A practical allocation: the mill supplies a test report per dye lot covering GSM, width, composition, dimensional change and colour fastness; the factory verifies incoming fabric against that report and records shade and width per roll; the buyer commissions independent verification on the first lot of any new fabric.
Also allocate shrinkage risk explicitly. Fabric that shrinks beyond tolerance in the garment, not in the lab, is usually a finishing or relaxation problem at the mill combined with insufficient relaxation before cutting at the factory. If both parties can point at the other, say so in the contract and require relaxed spreading before cutting.
Documentation Flow
Request OEKO-TEX STANDARD 100 certification valid for the product class, and GRS transaction certificates with scope certificates for any recycled content claim. For the US market, confirm REACH and CPSIA declarations where relevant. Certificates expire and are issued per scope, so check the date and the article classification rather than filing whatever the mill sends.
A Practical Recommendation
Use factory-nominated fabric for your first two programs. Once annual volume passes roughly 30,000 units or you have a fabric you want to lock for multiple seasons, move to buyer-nominated with direct mill contact. Reserve full mill-direct CMT for mature programs with in-house technical resource, because it converts a supply chain into a procurement job.
