“Costuming serves different, even opposite, functions for different people. For most, the wearing of team colors allows a fan to blend in with a mass of other similarly clad fans; it would be unwise to flout the color coding by inadvertently wearing the opponent's colors while sitting in a section of the bleachers occupied by home team fans. But for others, costuming - and in some cases, uncostuming, as with the Yalies who run naked through the stadium at the annual Harvard-Yale game - is a valid, some might say exhibitionist, bid for attention.”