any details
Those markings suggest the uniform of interwar period: 1918-1939.
See it here:
pl.wikipedia.org/wiki/Barwy_broni_i_s%C5%82u%C5%BCb_Wojska_Polskiego_II_RP
Particular kinds of troops had different markings, e,.g, artillery used green. The markings in the picture are darker than the uniform, so we can presume they are black, it may suggest sappers, among others.