Your outfit does more than sort out your ‘company’ needs; it also speaks volumes about you. You want it to convey the best possible message from you; here is how you can achieve that:
Try to direct attention to your strongest points and divert it from your weak ones. For instance, if you would not want anyone to focus on your bust, go easy on the cleavage your prom dress reveals. If you have stunning legs and arms, get a short, strapless dress and show them off. Do not get an evening dress with a train detail if you plan to dance the night away. And remember to match your hairstyle with the dress you are wearing.