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Wear a nice, button-up cotton shirt, but diss the tie.  They tie the outfit together casually.  (And that goes to girls, too!)
Dress comfortably so you can hang with your friends. Distressed jeans or corduroys look awesome and are a little bit more dressed-up for the dance rather than school. Throw on some sneakers (unless not allowed). Accent your outfit with a cool leather belt. No need to look like you're going to cotillion, just relax when you're picking out something to wear.