"This deep blue, genuine 1970s vintage, short sleeve, butterfly collared shirt is in excellent vintage condition. SIZE: Pit to Pit: 25\" Collar to hem: 31\" Sleeves: 11\" The tag does not have a size. Check the measurements. I would say it fits like a roomy XL The male mannequin would be 5'10\" 170 lbs. ITEM 125" Classic Blue Shirt For Summer, Blue Short Sleeve Shirt With Spread Collar For Summer, Formal Cotton Shirt With Short Sleeves, Classic Cotton Formal Short Sleeve Shirt, Solid Vintage Summer Shirt, Formal Short Sleeve Cotton Shirt, Blue Spread Collar Short Sleeve Shirt For Spring, Blue Short Sleeve Shirt With Spread Collar For Spring, Vintage Fitted Shirt For Summer