Here's the size guide — real numbers, pulled from AS Colour's own spec sheet and Printful's hat spec, not from my head. Paste-ready:

SIZE GUIDE

The Tee — Heavyweight Oversized (AS Colour 5082)

A deliberately oversized cut. It's a boxy, oversized fit with dropped shoulders, in a heavy 240gsm (7.1oz) 100% carded cotton, garment-dyed and pre-shrunk. Translation: it's meant to wear loose and roomy. gumroad

All measurements are the garment laid flat, in cm (inches in brackets). Allow up to ±2.5cm variation — that's within normal tolerance. gumroad

How to find your size: lay a t-shirt you already own flat, and measure straight across from armpit to armpit — that's the "body width" above. Match it to the column that's closest.

Fit tip: these run oversized by design. For the intended relaxed/streetwear look, take your normal size. If you want it less baggy and closer to a regular fit, size down.

Care: machine wash cold with like colours, don't bleach, don't tumble dry, line dry in the shade, and don't iron directly over the print. nardurna

The Cap — Retro Trucker (Yupoong 6606)

One size, with an adjustable snapback closure, and a structured six-panel mid-profile build with a mesh back. It fits a head circumference of roughly 54.9–60 cm (21⅝"–23⅝"). That covers about a 6⅝ to 7⅜ hat size — so it fits most adults. Joe's USA + 2

How to check: run a tape measure around your head, just above the ears and eyebrows. Anything inside that range, you're sorted — the snapback handles the rest.