CA4LA is a chain of stores in Japan specializing in stylish hats and head gear. I found out about it a while back when I was researching cool things to check out for my trip to Tokyo this summer.
The website is in Japanese but you can run it through Google translator if you want to read. I have been blindly clicking my way through often enough that I can navigate it in Japanese! Haha.
(For those of you in London, I believe there is a ca4la there if you wanted to check it out.)