We seem to have a veritable huge head club here

I'm still a 7 3/8 even without hair... Not a Big Head Club member...
I was surfing the site Bitt linked earlier for hat size. A Panama hat would be nice to keep the Texas sun off my neck, but they start at $425 and go to $20k!!! What the hell is in a $20k hat??? I think I need to stick to Shepler's Western Wear for the more traditional cowboy hat... $100