Vintage bomber liner from Japan

Jolted bomber liner from Japan - size I’m guessing is a small/medium as I am 6’1” 170 with relatively broad shoulders and it just doesn’t fit me. Pulls in the shoulders. Purchased at a night market in Bangkok. Definitely feels military inspired and probably would button into a bomber or flight jacket as a liner but wears really well with a wife pleaser and some nice baggy trousers