Likely a hunter vest from the 1960s. SIMCO aluminum zipper. Back panel is missing. Pit to pit: 49cm Back length: 64cm I, who usually wear XL, can barely zip up the front, so it would likely fit someone who usually wears S with room to spare, or someone who wears M, worn loosely without zipping. It's quite worn, but please understand that this is part of its vintage character. Foremost CANT BUST'EM PENNEY'S Montgomery Ward