How about changing the term Wars to something like Inter-House Games or Faculty Challenge or the likes to better align to the theme/context of this game? War doesn't seems to fit in.
Alright, I have made my decision: War-Drobe Catastrophe by Matt. Though I'm going to be tweaking it a bit to be this: The War-drobe Walk-Offs Dress for success, be better than the rest. Winners take the Limo, losers are walking to Prom! This is an individual war, where you earn 2 Limos per action, to a cap of 75 Limos. Winning side earns an extra 10 Limos.