When planning your Prom attire keep in mind not only how you want to look but how you would like to compliment your date's attire.
Basic black is the norm for a tuxedo for Prom but the choice is yours. Whether you choose a Tuxedo or Suit look as elegant as you possibly can. Avoid flashy patterns such as bright stripes or multi color designs. If you are going to Prom with a date you want to avoid clashing with her dress.
When considering your tux or suit consider your body type and height.