I think this whole public nudity thing is a generation question.
Present day (post 1980) people here are just as prude as americans (average americans), thanks to Hollywood.
FKK is generally considered something for perverts and old people or both...
Actually, I noticed a disturbing tendency among brits, and to lesser extend among americans to strip when drunk. Sadly this tendency appears limited to men

Germans do a lot of things when drunk, like vomiting, singing, dancing, doing the Hitler salute or starting fights, but they NEVER strip.