Sizing
We've kept this aggressively simple.
Caps & hats
One size, adjustable strap. Fits roughly 55–61 cm head circumference — i.e. most heads, and all opinions.
Beanies
One size, stretchy. It will fit. It will also slide up your forehead at the worst moment.
Apparel
Standard unisex sizing, S to XXL. Runs true to size; if you're between sizes, go up — shrinkage happens.