What should I wear? I'm graduating.?

My elementary school goes up to 6th grade and I'm graduating on Monday. We don't have gowns or anything and I asked my friends and one of them said she's gonna wear a party dress but one of my other friend's gonna wear those black pants that are really nice, lol idk wut they're called. One of my guy friends says he's gonna wear a nice shirt with slacks and a tie while my other guy friend says he's just gonna wear b ball shorts and a t shirt. so wut should I wear? I don't want to be overdressed but not underdressed either. can you include a link with examples if you can? :)