Disney parks let you show some skin, but not too much skin, at its parks. You must wear shoes and shirts at all times. You should avoid clothes with excessive ripping as these may violate parks' modesty rules.
Can you wear football tops at Disney?
I frequently see soccer/football jerseys and shirts in the parks. As long as you and your friends follow Disney's Guidelines for Attire you will be fine. "Proper attire, including shoes and shirts, must be worn at all times. The parks are a casual, family-oriented environment.