A brand founder ordered 800 two-piece sets from a Guangzhou factory that promised "stretch satin" and shipped a poly-spandex blend that bagged at the knees after three washes. The return rate hit 22 percent, the reorder never came, and the founder lost the season. The mistake was not the fabric choice. It was a tech pack that named a fiber content without a construction spec, a finish, or a test method. Every matching set order fails the same way: the buyer assumes the factory fills the gaps, and the factory assumes the buyer does not care. This article is about closing those gaps before the PO goes out.
The Fabric Spec That Prevents Bagging
Bagging at the knee is a mechanical failure, not a quality preference. It happens when the fabric’s recovery is too low for the garment’s intended use, and it is preventable if the tech pack specifies a stretch recovery test. ASTM D3107 measures fabric stretch and recovery after repeated extension, and a result of at least 90 percent recovery after 30 minutes is a reasonable minimum for a fitted two-piece set. Without that number on the spec, the factory will ship whatever greige goods the mill had on hand, and the first time you see the failure is on a customer’s body.
The fiber content line in the tech pack should read as a complete statement: "92 percent nylon, 8 percent spandex, 40D tricot, 210 gsm, brushed back, ASTM D3107 stretch recovery 90 percent minimum, 30 percent stretch maximum." That line gives the factory no room to substitute a 20D poly-spandex that costs less and recovers at 70 percent. It also gives the QC inspector a number to test against, and it gives you a clause to reject the shipment if the test fails.
The Color Communication That Prevents Off-Shade Lots
Color is the most common reason for rejection in apparel sourcing, and it is the easiest to prevent. The tech pack must carry a physical color standard, not a Pantone number alone, because Pantone numbers are interpreted differently by different mills and because digital color on a screen is not a contract. The standard practice is to provide a lab dip approval cycle of three rounds maximum, with the third dip being the final standard. The tech pack should state that the bulk shipment will be evaluated against the approved lab dip under D65 daylight, with a tolerance of Delta E 4.0 or less, measured on a spectrophotometer. That is a complete color communication, and it removes the subjective argument about whether the fabric is "close enough." Without it, the factory will match to the best available greige, and you will receive a shipment that looks right in the factory office and wrong in your customer’s bedroom lighting.
The Construction Detail That Prevents Seam Failure
Seam failure in a stretch set happens at the crotch and the waistband, and it happens because the stitch type and the thread specification are left to the factory’s default. The tech pack must specify a four-thread overlock stitch (ASTM D4914, stitch type 514) for all seams subject to stretch, with a textured polyester thread in the looper and a bonded nylon thread in the needle. The stitch density should be 14 stitches per inch, and the seam allowance should be 3/8 inch. That combination gives a seam that stretches with the fabric without breaking, and it is the same specification used in activewear that survives thousands of wear cycles. If the tech pack says "overlock stitch" without the thread type and the SPI, the factory will use whatever thread is on the cone rack, and the seam will fail at the first squat. The cost difference between a bonded nylon thread and a spun polyester thread is less than a cent per garment, but the performance difference is the difference between a return and a reorder.
The Measurement Spec That Prevents Fit Rejection
Fit rejection in a two-piece set is almost always a grading error, not a pattern error. The factory grades the pattern correctly from the sample size, but the grading rules are not specified in the tech pack, so the factory uses its own standard, which may not match the brand’s target customer. The tech pack must carry a grade rule table that specifies the increment between sizes for every point of measure, and the increments must be based on the brand’s fit model, not the factory’s block. For a women’s two-piece set, a common grade rule is 1 inch at the bust and waist, 1.25 inches at the hip, 0.5 inch at the thigh, and 0.25 inch at the inseam. Those numbers must be in the tech pack, and the tech pack must state that the grade rules are non-negotiable. Without them, the factory will grade to its own standard, which may be a 1.5-inch grade at the bust, and the size large will fit like a size extra large, and the customer will return it. The measurement spec should also include a tolerance, typically plus or minus 0.5 inch, and the tech pack should state that any garment outside tolerance is a reject. That gives the QC inspector a clear pass-fail criterion, and it gives the brand a contractual basis for a claim.
The Labeling Spec That Prevents Compliance Seizure
The fiber content label, the country of origin label, and the care label are not optional, and they are not the factory’s responsibility to design. The tech pack must carry the exact text, the exact placement, and the exact construction of every label, and the text must comply with the regulations of the destination market. For the US, that means the Textile Fiber Products Identification Act, which requires the generic fiber name, the percentage by weight, the country of origin, and the manufacturer or RN number. For the EU, it means the Textile Labelling Regulation, which requires the same information in the language of the member state. The tech pack should specify a woven label, not a printed label, for the fiber content and the country of origin, because printed labels fade and become non-compliant after washing. The care label should specify the ASTM D5489 standard, with the symbols and the text in the language of the destination market. The labeling spec is the last line of defense against a customs seizure, and it is the most common line item omitted from a tech pack because the brand assumes the factory knows the rules. The factory knows the rules for its own market, not for yours.
The Packaging Spec That Prevents Damage in Transit
A matching set arrives damaged when the packaging spec is absent, because the factory will pack for density, not for protection. The tech pack must specify the inner pack quantity, the carton dimensions, the carton burst strength, and the method of inner protection. For a two-piece set, a reasonable spec is five sets per inner pack, with each set folded and placed in a polybag with a size sticker, and the inner pack placed in a five-ply corrugated carton with a burst strength of 275 PSI. The carton should be lined with a waterproof liner, and the cartons should be palletized for ocean freight. That spec prevents the crushed cartons that arrive at the warehouse with bent hangers and creased fabric, and it prevents the moisture damage that happens when a container sits in the sun at the port. The packaging spec also prevents the hidden cost of repacking at the warehouse, which can add 50 cents per unit to the landed cost. The tech pack should state that any carton arriving with damage visible on the exterior is a reject, and that the brand reserves the right to inspect the contents before accepting the shipment. That clause shifts the risk of transit damage back to the factory, which is where it belongs.
The Timeline That Prevents a Missed Season
The tech pack is not complete without a timeline, and the timeline is not a suggestion. The tech pack should carry a date for the lab dip approval, a date for the fit sample approval, a date for the pre-production sample approval, and a date for the bulk shipment. Each date should have a consequence stated in the tech pack, such as a 1 percent penalty per day of delay, up to a maximum of 10 percent, after which the brand has the right to cancel the order. That clause is not aggressive; it is standard in the industry, and it is the only way to hold a factory to a schedule. Without it, the factory will prioritize the orders that have penalties, and your order will slip. The timeline should also include a buffer for the lab dip cycle, because color is the most common cause of delay, and a buffer for the Chinese New Year holiday, which shuts down production for three weeks every February. A brand that plans for those buffers ships on time. A brand that does not ships late and misses the season.
The Cost of a Complete Tech Pack
A complete tech pack costs between 500 and 1,500 dollars to produce, depending on the complexity of the garment and the experience of the designer. That cost is a fraction of the cost of a failed order, which can run into the tens of thousands of dollars in lost margin, returned goods, and damaged brand equity. The tech pack is the cheapest insurance policy in apparel sourcing, and it is the only document that gives the brand control over the outcome. Every line in the tech pack is a line that removes a variable from the production process, and every variable removed is a risk eliminated. The factories that produce the best goods are the factories that receive the best tech packs, because a good tech pack tells the factory exactly what to make, and a good factory makes exactly what it is told. The relationship is not adversarial; it is collaborative, and the tech pack is the common language that makes the collaboration possible. A brand that invests in the tech pack invests in the outcome, and the outcome is a matching set that fits, wears, and sells.
That is the only outcome that matters.
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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