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.

Shoulder to shoulder: 20″

Sleeve (shoulder to cuff): 23-7/8″

Length (base of collar to hem): 31″