Yeah, I am sure it doesnt matter what uniform you wear. But I know your into realism and thats a huge part of this event. So I trust your teams loadout will reflect your playing style, bad a$$ and true to life. I would say there is no issue wearing you black loadout, but most teams do something with their uniforms to make them unique.
Overall, wear what is comfortable and apllicable to this type of event. The most important thing is that you look like a team and that you look f*cking scary!