Ok, so it would not surprise me if I was the last person to know about this .... but apparently there is a designated "symbol" (sun and sea) that tells everyone that you support Naturism. I searched around some more and found a website (Redubble) that makes real nice T-shirts with the symbol on the front and the word NATURIST just below it. I placed my order and am excited to have someone see it and smile as we pass. OR, maybe it will start a conversation!!

I think you mean redbubble (the b be missing)

is this our flag ?
https://commons.wikimedia.org/wiki/File:Nudism_Pride_Flag.svg