Analogy: Let's say you take a free intro taekwondo class. They outfit you with a white belt, obviously. But you think the red/black belt looks cool, so you start wearing that instead - maybe not in the dojang even, but just around town. You don't think martial artists should have a problem with that, maybe even challenge you to a fight? And even non-martial-artists shouldn't think you're kind of a poser?