There's nothing wrong with being too dressy at the Starlight Ball. That's why there's a sign up for the costume contest during the event. Winner get's to go to next year's ALA for free!
Cosplay list: Brain Age Guy, Andross (SNES version), Master Hand/Crazy Hand, Colossal Titan with Wall Maria, Tuxedo Totoro
Deviantart ACE Cosplayer