Good question! I'm lucky my work is pretty flexible, so I can get away with looking a bit goth. I tend to go for an alt girl shirt with black pants and a cardy, or I'll wear a knee length goth dress with black tights. I don't think I could work somewhere that needed me mega formal it's just not me.
Outside of work I just think sod it, I can wear what I want! So the bright tights and stuff come out then. I've never been mega goth with make up, so that's never an issue for me.