Rockies 80s Funky Abstract Western Button Cowboy Shirt sz med Unisex

Vtg Rockies (Rocky Mountain Clothing Co) Abstract black green white 80s men's (?)sz medium shirt. Awesome abstract design. Chest portion of the shirt is lined with black. Button flap in the back and on both sides of the chest. Fabric is medium to heavy weight. EUC. No signs of wear. This shirt is unisex. Model wears athletic men's medium. He says the buttons are on the "woman's" side of the button placket. I wear a medium and the shirt is too large for me. Please review measurements. 18" pit to pit 19" shoulder to shoulder 22" shoulder to cuff 28" shoulder to hem (longer in back) western, Rockies, wild, abstract, unisex