Sexy halloween costume for 13 year year old girl?

alright, i need a sexy but not too sexy costume for halloween, not too sexy to where i cant leave the house though cause that gets me nowhere ha. i need something along the lines of sexy little bo peepish kind of thing, but i cant be that because my friend is already so yeah, please help! links would be great thanks!
Update: sorry guys i know i sound like a slut but i swear im not soo let me refrase the question...CUTE halloween costumes
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