In what world do you see anyone (much less that football team) "dictating" what you wear?
There are some exceptions to the rules.
If the person attending the game is a student with a ticket in the student section, depending on what the student section is promoting, you may very well have to wear a specific color to be in that area. It is not unsual for there to be a white out student section. If your ticket is for that area, you need to wear white or be ready to sit else where. The student sections are known for being the rabidest of fans and they have their own set of rules for being in that area. I have not ever seen that you have to wear that years shirt or else, but most of the kids who go game in, game out, know this and they get the special t-shirt(s) for that season. When it's for a special cause, pink for breast cancer, usually the school will foot that bill and the shirts are placed on the seats in the student section and when the kids get in there, they change into said t-shirt.
