Thanx! So accordind to your article, I was managed to make some sort of timeline with photos.
1886
In russo Japanese War they changed colour to khaki
in 1911 they changed uniform.
Wikpedia tells that in 30's 5shiki Gun-i/Type 5 was introduced:
The Showa Type 5, also called the M90 or 2590 or 1930 uniform was basically the 1911 uniform but introduced internal breast pockets with scalloped pocket flaps on the tunic for all ranks. Also the straight trousers were later replaced with pantaloons which were worn with woolen spiral wound puttees and tapes.
And I suppose M98 uniform is same that was used in Soviet Japanese late 30's wars and WW1.
So, if uniform of 30's was close to WW1 uniform but with spiral wound puttees, I can take these Peter Pig figures:
and headswap them with these heads?
WW1 Feldmutz German cap but will sculpt screen