Simple Halloween Costume

what's a very very simple Halloween costume?
I need a simple costume that's child appropriate (I'll be working at a christian camp) that is just like an average clothing with just some accessories or something? and in case you didn't guess, I'm a girl, but if you have ideas for a guy too please tell. thanks!

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Best Simplest Halloween Costume Ideas?
i'm still considering myself to dress as Lady Gaga, Justin Bieber, or an asian nerd. so what are the best halloween costumes for this year? ideas please! no..picard. :( and uh..im 12. >__>

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