Re skinning Citizen Model

So I’ve been looking into re-skinning the citizen clothing, although what has been bothering me is how exactly the texture is laid out.
I’ve figured out a general idea of what parts of the material match up to the body, but it’s a bit inaccurate because what I did was add numbers to varying body parts of the material and check in-game where they were. This makes it difficult to make the clothing that I would put on more detailed since it wouldn’t be 100% accurate, is there a more efficient way to do this?

This is an example of the material I’d be re-skinning.

http://puu.sh/6I6RJ/d5841813d9.jpg

Best thing to do is decompile the model and check the UVW