Well, the clothing is supposed to be futuristic. I've never seen any clothing like some androids wear, or the coat Markus wears in the picture. I think it'd be hard to find a coat similar to it, or the style.
It's an overcoat. But it also look like a women's trench coat too... The design I've never personally seen but those are expensive. Maybe he got a deviant who made clothes to make a custom one for Markus?