No one will argue that dressing like a Juggalo is more important than appreciating the horror rap music of Insane Clown Posse. In fact, were you to make that argument with anyone they would undoubtedly label you as a poser trying to infiltrate a scene without actually believing in it, and after something like that happens it would be difficult to regain trust of Juggalos in the future no matter how many Insane Clown Posse hoodies you wear.
However, with that said, once you are positive horror rap is your style of music, adopting the fashion of its purveyors and fans is the next logical step.