[33girl]

umm, if we would have made the guys wear tuxes, we probably would not have had guys at our formals.

Like Betarulz said, it's one thing if you have been going with the guy for three years and pool your resources a lot anyway. It's another thing if you ask a guy you know casually and then say "oh by the way, you need to spend $50 (minimum) to rent a tux." Imagine if a guy asked you to his fraternity formal and then said "oh by the way, the only dresses you are allowed to wear are Armani or Prada."

You really need to back down on this one...because the way it's going this will not be the perfect formal you worked and planned for, it will go down in history as "Tuxgate" or something of the like.