A 500-piece run of satin slip dresses came back with every hem puckered and the side seams twisted. The factory had sewn to the spec sheet, but the spec sheet never said which way the bias should fall, what stitch density to use on the satin, or how much ease to build into the waist. The buyer had chosen the factory on price and MOQ, not on whether it could hold the tolerances the fabric demanded. That is the gap this article closes: what to put in the tech pack, what to verify on the sample, and which standards to cite so the next run comes back right.
The Tech Pack Is the Contract
The tech pack is the only document that binds the factory to your expectations, and most packs are missing the measurements that decide whether a dress fits and hangs correctly. A typical pack lists bust, waist, and hip, but leaves out the cross-seam, the armhole depth, and the shoulder slope. Those three numbers, taken from a graded pattern, are what prevent the pulling and gaping that turn a dress from wearable to returnable. Specify them in centimeters with a tolerance of plus or minus 0.5 cm on each, and require the factory to submit a measurement report against those figures on every production lot, not just the pre-production sample.
Quality control against the spec sheet, not against a photo, is what separates a factory that makes dresses from one that makes your dresses.
Fabric Behavior Is a Specification, Not a Hope
The fabric section in most tech packs names the fiber content and weight, and stops there. That leaves the factory free to substitute a weave that sews easier but drapes wrong. A dress that depends on drape, like a slip or a wrap, needs the fabric specified by construction: ends per inch and picks per inch, yarn count, and finish. A charmeuse woven at 210 ends and 110 picks will hang differently from one woven at 180 and 90, even at the same weight. State the construction, and require a 2-meter lab dip and a full yardage of bulk fabric for approval before cutting. The factory should also report the shrinkage in both directions, tested to AATCC 135, and the tech pack should carry a note that the pattern was graded for that shrinkage. Without that note, the factory cuts to the marked size and the dress shrinks to a size smaller after the first wash.
Seams and Stitches Carry the Load
A dress fails at the seams before it fails anywhere else, and the tech pack must specify the stitch type, the stitch per inch, and the seam allowance for every seam that carries stress. The side seam on a fitted dress, the waistline seam on a dress with a bodice, and the armhole seam all need a lockstitch (ISO 301) at 14 to 16 stitches per inch, with a seam allowance of 1.5 cm. A factory that runs a chain stitch (ISO 401) at 10 stitches per inch will deliver faster and cheaper, and the seam will ravel the first time the dress is pulled on. Specify the stitch, and require a seam strength test to ASTM D1683 on the pre-production sample. The report should show the seam holding at 80 percent of the fabric strength before it fails. If it fails earlier, the stitch is wrong, the tension is wrong, or the needle is too heavy for the fabric.
Trims and Closures Decide Fit and Durability
A zipper that is 5 mm too short will gap at the waist, and a button that is 2 mm too small will pull through the buttonhole. The tech pack must list the exact size, material, and color of every trim, and require the factory to submit a trim card for approval before bulk. The zipper should be specified by type (nylon coil, metal, or invisible), by length in centimeters, and by gauge. A #5 nylon coil zipper is standard for a side-seam dress; a #3 is too light and will catch. The button should be specified by diameter in ligne (40 ligne = 1 inch), by material, and by color, and the buttonhole should be specified to match. Require a pull test on the button to 90 newtons, and require the zipper to cycle 500 times without failure. Those two tests, run on the pre-production sample, catch the defects that show up after the dress is worn, not before.
Labels and Compliance Are Not Afterthoughts
A dress that ships without a care label, a fiber content label, or a country of origin label will be stopped at customs, or returned by the retailer, or both. The tech pack must specify the label type (woven, printed, or heat transfer), the label content, and the label placement, and it must cite the regulation that governs each. In the US, the care label must meet FTC 16 CFR 423, the fiber content label must meet the Textile Fiber Products Identification Act, and the country of origin label must meet Customs 19 CFR 134. In the EU, the fiber content label must meet Regulation 1007/2011, and the care label must meet ISO 3758. List the standards in the tech pack, and require the factory to sew a sample label into the pre-production sample for review. A label sewn in the wrong place, or with the wrong content, is a defect as serious as a broken seam.
Sample Approval Is the Gate, Not the Finish
The pre-production sample is the last chance to catch a defect before it is multiplied by the run size, and most buyers treat it as a formality. The sample should be reviewed against the tech pack, point by point, and the review should be documented in a fit report. The fit report should list every measurement in the tech pack, the measurement taken from the sample, and the pass or fail against the tolerance. It should also list the fabric construction, the stitch count, the seam strength, the button pull, and the zipper cycle, each with a pass or fail. A sample that passes on fit but fails on seam strength is not a pass; it is a warning that the production run will fail in the field. Require the factory to correct every fail and submit a second sample, and do not approve bulk until the second sample passes on every point. That is the discipline that keeps a 500-piece run from becoming a 500-piece loss.
Factory Selection Is the First Quality Decision
The tech pack is only as good as the factory that reads it, and the factory should be chosen on its ability to meet the standards the tech pack cites. Ask the factory for the names of three clients with similar products, and call them. Ask how the factory handled a defect, how fast it shipped, and whether it met the tolerances in the tech pack. Ask for the factory’s quality manual, and look for the standards it cites. A factory that cites ASTM, ISO, and AATCC is a factory that tests; a factory that cites only its own inspection is a factory that hopes. Ask for a sample of a tech pack the factory has used before, and see how detailed it is. A factory that asks for detail is a factory that can work to detail; a factory that asks for a photo is a factory that will guess. The choice of factory, made on evidence and not on price, is the first and most important quality decision in the process.
The Dress Is in the Details
A dress is not a sketch and a fabric; it is a set of measurements, a set of seams, a set of trims, and a set of standards, all held together by a tech pack that leaves nothing to guesswork. The factory that makes the dress is a partner, not a vendor, and the partnership is built on a document that specifies every detail and a sample process that verifies every detail. The buyer who writes the tech pack to the standard this article describes, and who selects the factory on its ability to meet that standard, will get a dress that fits, hangs, and lasts. The buyer who does not will get a dress that puckers, gaps, and returns, and the cost of those returns will be higher than the cost of the tech pack that would have prevented them.
The details are the dress, and the tech pack is where the details live.
What to send us
If the specifications above match what you are sourcing, send your tech pack to Orange Sea Clothing. If the pack is not written yet, sketches and a reference sample are enough to start — sample development covers the design review, fabric and trim sourcing, pattern making and the first prototype, so you see fit and construction before you commit to a production run.
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