This vintage mackinaw was made in the late 1930s-early 1940s for Penneys and was sold under their Sportclad label. It is a blue-green and brown plaid, with a belt back, double breasted cut, has handwarmer and flapped cargo pockets, and as typical of these early coats, is unlined.
Chest (pit to pit): 23″ (doubled = 46″)
Shoulder to shoulder: 20″
Sleeve (shoulder to cuff): 23-7/8″