Pony, I don't have a lot but here is what I have.
Uniform, I have pants,one 2 pairs of real Soviet Sharpovi breeches. They are post ww2 but are dark blue wool/poly. With a bit of tailoring they will work. I also picked up a post ww2 Gymnastoirka,wool. The pattern is correct but the buttons are of course Soviet. I need to source some Czarist buttons and shoulder boards. All from Fleabay, cost about $75. I also have a pair of repro cotton Kahki breeches. Boots are being made, bought off of fleabay.
I have one repro Czarist Mosin Nagant ammo pouch. A M1895 Nagant revolver,numerous Mosin Nagant rifles. I have a US CW sabre(repop) that I think can be modded to work. Basically replace/remodel the guard.
I think that I might have a source of real leather M1895 holsters. If so I will get 2 and use these on a basic leather Sam Browne belt with the Nagant pouch.
No head gear yet, I haven't decided on a carbine or shotgun yet.