Soma & Juste = pimping. No homo. I mean their fashion sense. Dario must have stolen Soma's fur before DoS.
But my all time favorite has to be SCVIV Simon. Badass armor, badass look. Badass overload.
Nathan's rags are pretty spiffy too. But if I'm talking realistically, Julius' attire is the only one I'd have the guts to wear.
As for the females, Succubus Camilla I like Julia's style. It's not too outrageous, but not too plain. And of course Pachislot Sypha.