Misuki Marishima
Yeah, prom isn't about... fun or anything, it's about jealousy.
And making sure no one's wearing a dress even remotely similar to your MCs. If that b***h over there's wearing a dress just a liiiitle too close to your MC's color and/or silhouette, be sure to have your MC have a hissy fit, then "accidentally" trip and spill red punch all over the poor girl. Your readers will totally sympathize with this vicious act and not at all with the innocent party because clothes are an important part of every good character! In fact, they're so important, you must dedicate at least one paragraph for every character you introduce describing how they're dressed and what they look like, plus at least one sentence for every new day/outfit.