We have been to the Club O beach hundreds of times and my wife almost always wears some kind of bikini bottom. We always see everything from string backs, thongs, bikini bottoms in every imaginable size, style, sheer or not and have never seen or heard of anyone making any negative comments about them. In July, I would estimate that at least 30% of the women there had some kind of bottom on and some wore tops. I would say that men wearing thongs, speedos etc are rare, but, I've never seen or heard of anyone being harassed for what they were or were not wearing,,,