The French Foreign Legion hat looks like this:



The white cotton cover is detachable for easy cleaning... They also say it's "hand-blocked, wool felt". I'm not sure to know what hand-blocked means, it's a term commonly used in hat industry apparently.

Frankie

That would be the kepi blanc, aka the white hat. But not the only cover they wear...

I believe that simply means that the wool felt upper was shaped by hand.

If you ever get a chance to watch someone hand block a hat, maybe the custom cowboy hat you are having created, be sure to do it, it is pretty interesting...