Don't let these measurements fool you, this thing is SLIM, I have a headporter quilted shirt as well, which actually measures smaller, but it fits roomier. 100% nylon, 5.5 oz. of 700 fill down, square quilted. Shirt collar on a stand, and a shirt tail hem. Snaps on the placket, chest pocket and cuffs. Condition: 10/10 Brand: Crescent Down Works Tagged Size: Medium Main Color: Black Origin: Made in USA Chest: 22" Shoulder: 17" Back: 27" Sleeve: 24" Unlike CDW other jackets, this one fits pretty slim. I would say perfect for a true M.