I was wondering something. Is there any place to find a dark brown flight suit like Venkman’s in the real ghostbusters?
You’re probably better off dyeing a tru-spec. Thats what I did for mine and my friends’ RGB costumes.
That sounds like a plan. I’d like to see pictures of those too sometime. 
I bet their cool. 
I’m mostly finished with an RGB Venkman suit that was the result of a botched suit dying. The black suit I was trying to bleach and dye to a GB2 gray turned dark brown and stayed there. You could try to bleach a black suit also, but I think it’s not such an exact science to be worth betting your money on.
That would be pretty cool to see. What kind of dye did you use? If I may ask.