I've been to several soccer stadiums in Europe where you can't wear the colors of the visiting team, they'll turn you away at the entrance. Even at the Loon's stadium they have a sign in the Wonder Wall section saying no opposing team jerseys are allowed. Are there any college stadiums where this is enforced? I get that there are a lot of stadiums where you're an idiot for wearing the other team's colors (e.g., no way I'd show up in Philly wearing a Cowboy's jersey), but are there any where it's an official rule?