This is a Russian prisonjacket, a so called “Telogreika”,which was intended for German prisoners of war (and also dutchmen joined German service).
There are no stamps inside and it is thus undated. These were also used immediatly postwar as many german prisoners were kept for years in Russian prisonercamps.
See the added pictures for exampes how these were worn.
The jacket is worn, but definately not abused. It has that ypical “been there” look.