Shrinkage and Fabric Growth Solutions for Swimwear: Sourcing Checklist for Buyers
Questions to put to any mill supplying swimwear with shrinkage and fabric growth specified.
Capability questions
Ask for the test equipment list and the standards used. The relevant method here is AATCC 135 dimensional change, and the mill should be able to show recent reports. Because the fabric stays wet, stretched and chemically exposed for hours, target checks are made on a worn sample rather than flat fabric alone.
Documentation
Request the technical data sheet, composition certificate and previous results for under 3% in length and 4% in width after five washes. Consistent paperwork usually reflects consistent process control. Keep AATCC 135 dimensional change named in the tech pack so every lot is measured the same way.
Mill visit checks
Look at finishing conditions and testing frequency. Problems such as dimensions change after washing or hanging often come from process drift rather than design. Where swimwear is worn for pool training and beach use, set tolerances around that range of movement.
Commercial terms
Confirm minimum quantity, lead time and the cost impact noted as slower stenter throughput raises unit cost slightly before development work starts. Any change to nylon and polyester knits at 190-230 GSM with high elastane requires re-testing against under 3% in length and 4% in width after five washes before bulk is released.
Warning signs
Be careful where samples perform differently from bulk, or where reports are only issued on request. Past reports from AATCC 135 dimensional change help the mill reproduce the same recipe on the next order.
