What I should wear for a 50's theme ladies night out?

I need YOUR help! On Thursday our church is having our monthly Ladies Night Out and it is 50's themed. I am way excited about it but I have a girls worst nightmare....nothing to wear!!!`I would love to hear/see your ideas! I need to decide what to wear as well as how to get it or make it for cheep. :) Hmm...maybe if I go with your idea, I'll send you a gift in the mail?!