So you're going to be in the audience, then?
I would suggest going with burlesque-inspired clothing rather than a full-on burlesque costume. There's really no need for you to try to compete with the burlesque dancers or to pretend you're one of them. I think as long as you dress in the same vein as the theme, you should be good.
I'd recommend getting a corset top from Charlotte Russe (they seem to have a good selection of corset tops) or maybe Forever 21 or someplace like that. Then you could wear actual bottoms (pants, shorts, or a skirt) with it. That way, you get the burlesque feel, but you're actually wearing clothes rather than a costume.
Oh, and if you can, heels are a good idea for completing the look.
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