Hotlinking not allowed. Different picture?
Karakuri Burst Song
You could always alter an existing pattern, such as a tailored or military style jacket that is shorter but is essentially the same. You basically use the pattern as a base and elaborate on top of it, adding length or removing a particular collar for a simple change.
The designs for the uniforms reminds me strongly of DOLLS
by Naked Ape. There are probably some tutorials available for making the coats for DOLLS, and if nothing else, there are DOLLS cosplayers that you could probably track down. ^^; I'm sorry this wasn't very helpful.