In the 1980's I was doing research on 'Urban Communes' and was invited to a community in San Francisco, to study their format. Over the first weekend, they told me they were going to spend a weekend at Harbin Hot Springs and had booked a place for me too because, they said, it would be a good place to rest and get over jet-lag. What they omitted to tell me was that Harbin is a Nudist Hot Springs Resort......
So we drive up there from S.F. and I'm in my room, unpacking. The curtains on the window are open and three young ladies walk by and they are stark naked. I shook my head and said 'Nah..! You're either hallucinating or imagining things. Then a whole group went by and sure enough, every one of 'em was nude.
I opened the cabin door and looked out and realized that nudity was the 'undress-code. O.K. What to do..? Well, when in Rome, do like they do in Harbin. So I got undressed and sauntered outside. Nobody jeered, nobody hooted, everyone went about their business. I got down to the pool and my hosts were all laughing, since I had made it and cottoned on quickly and joined in the relaxation.
The interesting thing was, you get used to it very quickly and if you walk about in the buff for a complete weekend, you revert to going about your business without your brain screaming at you, 'My God..! THEY ARE ALL NUDE...!'
It was almost with a tinge of regret that I got dressed to go back to S.F. Quite enjoyable.