bachelorette party!

So I'm having my bachelorette party the weekends before I get married (October 22 is the bachelorette party day). My bridesmaids are keeping what we're doing a huge surprise from me, but I do know we are going out. What should I wear?! I'm a fashion failure and I'm curvy so a lot of the stuff I've seen on Pinterest doesn't come in my size (I'm a 14). I have been told to look sexy, but I don't really have anything that is white/champagne colored that is "sexy". Mostly just work appropriate clothes. Any suggestions?