What Top Sportswear Manufacturers Look for in Your Tech Pack Before Production

There’s a moment every new brand dreads: you’ve finalized your designs, you’ve found a sportswear manufacturer you’re excited about, and then they ask for your tech pack. Silence. Maybe a half-finished Illustrator file gets sent over, or worse, a Pinterest board. And just like that, the conversation stalls.

This happens more than manufacturers like to admit. And it’s not because designers don’t care, it’s because nobody really explains what a factory is actually looking for before they agree to produce your line.

So here’s the honest version.

A Sketch That Explains Itself

The first thing any clothing manufacturer looks at is your technical flat. Not your campaign imagery, not a rendered mockup with dramatic lighting a clean, proportional drawing that shows the front, back, and side of every piece.

Think of it less like art and more like instruction. The person reviewing your tech pack for clothing production isn’t a creative director. They’re a pattern maker or a production manager trying to understand seam placements, panel breaks, pocket positions, and construction details at a glance. If they have to guess, something will go wrong, and it’ll show up in your first sample.

Fabric Info That Goes Beyond “Soft and Stretchy”

Sportswear manufacturing is technical by nature. A custom streetwear manufacturer or performance-focused factory isn’t just looking for a vibe; they need the actual specs. GSM, fiber composition, four-way stretch percentage, moisture management properties, whether it needs to be bonded, laminated, or sublimation-ready.

Leaving fabric details vague forces factories to either substitute or stop and ask. Both options slow everything down. The more specific the callout, even a reference to a supplier code or a comparable fabric, the faster things move.

 

Size Specs That Cover the Whole Range

One size measurement does not a graded spec sheet make. Every size in your run needs its own set of measurements: chest, length, shoulder, sleeve, inseam, wherever critical dimensions live on that specific garment.

The sportswear manufacturing process depends on these numbers being locked in before sampling starts. Factories also want to know the tolerance ranges, how much variance is acceptable before a piece gets flagged. Without that, quality control becomes a guessing game on both sides.

Every Trim, Named and Located

Zippers, drawcords, eyelets, cord stops, elastic widths, and reflective tape; every single trim detail needs to be documented. Not just “black zipper” but the finish, the length, the pull style, the supplier, if you have one, and exactly where it sits on the garment.

Smart clothing factories deal with volume. They can’t be making judgment calls on hardware, and they won’t. If the information isn’t there, you’ll either get a question back or a substitution you didn’t ask for.

How It’s Actually Sewn

This is the section most brands forget entirely. The sportswear manufacturing process involves a lot of stitch decisions, flatlock, coverstitch, overlock, chainstitch, and each one looks and performs differently. Your tech pack needs to specify which stitch type goes where, what SPI is expected, how seams are finished, and where reinforcement, like bar tacks, should appear.

Bonded seams, taped seams, and raw-edge finishes all need callouts. A factory left to decide on its own will choose whatever’s fastest. That might be fine, or it might completely change how your garment looks and holds up.

Pantone Codes, Not Color Names

“Forest green” in your head and “forest green” in a factory in Vietnam are two completely different colors. Pantone references fix that problem. Every colorway fabric, thread, zipper tape, and printed element should have a code attached to it.

This matters especially when working with a clothing manufacturer remotely, where screens, lighting, and printing environments all introduce color drift. A Pantone code is the only thing both sides can point to when a sample comes back wrong.

Print Placements with Real Measurements

Any logo, graphic, or branding element needs exact placement specs  not “centered on chest” but the actual distance from the collar seam, the size of the artwork, the print method (screen print, embroidery, heat transfer, sublimation), and the colorway reference for that print.

This is one of those details that looks minor until a sample arrives with a logo sitting two inches too low and slightly crooked. Real measurements remove the guesswork.

A Bill of Materials That Lists Everything

A BOM isn’t glamorous, but it’s what keeps production from derailing. It’s a full list of every component in the garment fabric, lining, thread, elastic, labels, hangtags, polybags, everything. Factories use it to cost out orders and plan sourcing timelines. Without one, pricing becomes an estimate, and estimates tend to become surprises.

Here’s the thing about a well-made tech pack: it’s not just about giving the factory what they need. It’s about showing them you know your product. Manufacturers take on risk with every new client, and a thorough tech pack signals that this brand has done the work, knows what they want, and won’t be a nightmare to sample with.

That reputation travels fast in this industry. Build it early.