Check out cheap-lingerie.com. Their sizes run small so keep that in mind. It might be perfect for a small framed woman with a large bosom. My opinion... make it fit everywhere else and let the boobs go where they may!
I echo what others day. Bring things that you think you'll wear and bring some that push your comfort zone. You'll be surprised what you will feel comfortable with at the end of your trip. Our first trip, I brought things I never ever ever thought I'd wear in public, and those ended up being my favorites. My more normal dresses and shorts never got worn. Plan for both - crazy and mild. Buy a few cheap slinky items and see what happens!
the motto is... no one knows you and no one gives a shit you will find that is very true... i think everyone is just looking for a fun escape from their real world... work... job... kids... or whatever... majority of people that go there are pretty laid back and not easily offended by some of the crazy things that happens... i am sure you will have a great time and be hooked like so many others!
No need to be nervous. It will be the best trip you have ever taken and the only thing you will keep are the friendships and they may last forever
Relax. You´ll have a great time, people are extremely friendly over there and you will make new friends in a breeze and feel like you´ve known them for ages. Just be friendly too and everything will be alright.