Very cool! This would be a fun project to do for a group photo op. I was checking out the various unit types, officers/engineers etc. Lots of possibilities, you can look really mean without having to worry so much about a bunch of armor fitting right.
Seems like the basic soldier is more or less a trench coat with an armored cuirass over it. As well as a helm and shoulder plates.
The only concern I have is where to find those kinds of gray overcoats (with a ridiculously high collar) without asking my gf to make one for me :/