Are you more likely to wear skirts, wraps, dresses etc..than an actual bikini. I'm watching a show right now where they're all just wearing skirts etc..I don't see a single girl in JUST her bikini/swimsuit
It really depends on the party and who is all going. I would mostly pick something beachy though. I would probably wear my swimsuit underneath, all depending on what we are doing.
Some people find just wearing a bikini or swimsuit isn't enough support (like for the well-endowed), so that might be a reason some of the girls chose not to wear a bikini. Especially if you are playing volley ball or something like that.
But I would probably wear a sundress, or bright colors, or anything with a beach print on it :)