Flat measurement

Flat measurement means exactly what it sounds like: the shirt is smoothed out on a table, front facing up, with no tension pulling the fabric taut, and every dimension — chest, length, sleeve — is read with a tape measure straight across or straight down the fabric. It's the industry-standard technique behind essentially every published size chart, from Gildan's spec sheets to a boutique brand's Shopify size guide, precisely because it's repeatable: two different people flat-measuring the same shirt should land within a fraction of an inch of each other.

What makes this useful for a buyer is that it's a technique anyone can replicate with a shirt already in their closet. Lay a favorite tee flat, button or zip it if it has a closure, smooth out the wrinkles, and measure armpit to armpit for chest width and high point shoulder to hem for body length — the exact same steps a manufacturer's quality team runs before a size chart ever gets published.

We tell every customer sizing a group order the same thing: don't guess from body measurements, flat-measure a shirt you already like the fit of and match those numbers against the new blank's chart. It resolves size questions faster than any conversation about "true to size" ever will.

The common mistake is measuring a garment while it's on a body or stretched over a mannequin, which pulls the fabric and inflates the numbers. Flat measurement only works flat — tension of any kind defeats the whole point of a standardized method.