My bad. Didn't consider the possibility that they could be referring to UK / US chest size. Kinda misleading on a size guide for trousers, though I'm guessing it's a universal size guide they use across the website.
Thats great, I'll be getting the cap then.
On a side note, am I the only one that doesn't like the shoes? I appreciate the design and thought that's gone into them but I think the shoe itself is rather ugly.