I got the body suit custom made from a chinese seller on eBay. If you search for zentai body suit, you should find quite a few results! I lot of the sellers will allow you to provide custom body measurements at no extra cost. I then decorated and added the markings myself with markers.
The markings? Well, instead of using paint or anything like that, I actually just bought a load of dark blue permanent markers from my local WHSmiths! Went through about 5 in the end. They were about a pound each. Not bad, really!
Ah, now THIS is a cosplay! Can't believe it didn't occur to me that your hair needed to match with the rest of the outfit; God, I'm such a dumbass. But then again, I am a guy; and even as much as I've let my own hair flourish (it goes past my shoulders now), I still am oblivious as to the things that can be done with it, or how it is to be propperly applied. Sad Face.
Face paint is also a step up, too. Add the dramatic shadows and the pose, and you've nailed it. I can't believe I never commented on this sooner... I'm such a dick....