I have friends that went to school all over the southeastern United States. It was always interesting to me to go to one of their football games and see what everyone considers appropriate dress. It truly runs the whole gamut.
Jacksonville hosts "The World's Largest Outdoor Cocktail Party" (aka the UGA/UF game) every year. You get to see two completely different types of game day attire in the same place. One half of the stadium is dressed pretty nicely and the other half is wearing tank tops and jeans shorts. It's always a good party, though, and that is the important thing, I guess.