Sampling Workflow: From Tech Pack to Confirmed Fit Sample

Most buyers budget four weeks for sampling and then wonder why the bulk order slips six. The cause is rarely factory slowness; it is that sampling for a structured stretch garment is a sequence of gates, not a single event. A medium impact bra with a racerback convergence, a back cut-out and a three-row hook closure has interactions between the underband tension, the strap angle and the pad pocket that only show up on a body. Knowing the gates in advance lets you plan for them instead of reacting to them.

Stage One: Tech Pack Lock

Nothing should be cut until the measurement spec, tolerances, bill of materials and construction notes are signed. This is also when fabric and trim are confirmed in writing, including composition, GSM, stretch and recovery targets. Budget 3 to 5 days for this gate; it is the cheapest time to make changes and the most expensive place to skip.

Stage Two: Fabric and Trim Approval

Before the first prototype, approve a lab dip or bulk dye standard under a D65 light source and confirm handfeel on a production-weight swatch, not a lab sample. Confirm the elastic modulus and width, and the hook tape grade and row count. Allow 10 to 20 days. Programs that skip this gate routinely approve a fit on fabric that never appears in bulk.

Stage Three: The First Fit Sample

Also called the proto or development sample. Expect 15 to 25 working days from tech pack sign-off for cut-and-sew with cut-out panelling.

Evaluate it on a live fit model whose measurements match your base size spec, not on a dress form. A form cannot tell you whether the cut-out edge lifts when the arms move, whether the converged racerback strap rides toward the neck, or whether the pad pocket twists when the band is fastened on the middle hook row. Check the band tension on all three hook positions, because most wearers use the loosest row and most samples are fitted on the tightest.

Stage Four: Revisions and the Salesman Sample

Each revision round costs 7 to 10 working days. Two rounds is typical; four is a warning sign that the block itself is wrong rather than the spec. Once fit is close, request a salesman sample made in bulk fabric and bulk trim for photography and internal sign-off. This is the sample that exposes fabric behaviour differences between development cloth and production cloth.

Stage Five: Pre-Production Sample

The PP sample is made on the production line, with production patterns, bulk fabric and bulk trims, in the base size and usually one adjacent size. Allow 10 to 15 days. It is your last chance to catch a systemic problem before hundreds of units inherit it. Approve it in writing and seal a reference sample with a dated signature.

Stage Six: Size Set and Top-of-Production Sample

Request the extremes of your size range alongside the base size, and measure every piece against the graded spec before approving. Then pull a top-of-production sample from the first bulk cut and compare it side by side with the sealed PP sample, including the removable pads and the hook closure alignment.

Total realistic time from tech pack to confirmed fit: 8 to 12 weeks. Every week you compress comes out of fit confidence, and fit is what drives returns.