It is hard to express oneself from the inside while playing a sport like basketball. That is why an exterior appearance expresses not only the creative and physical elements, but also the emotional ones too.
Hockey and football equipment limit outside looks, while sports like basketball and, sometimes, baseball help share an athlete's presentation.
The way you style your hair, your physical traits, and all of the above can help separate one player from the other. Suggestions like these give athletes their recognition, which can transform into a trend or a movement.
Never judge a book by it's cover, but in this case, you are exempt.