http://www.ebay.com/itm/271397626926
This vintage Officer’s Short Overcoat / Shawl Collar Mackinaw was made in 1942 by high-end clothier Richman Brothers under contract for the US Army. This style coat was a direct descendant of the shawl collar workwear mackinaws of the 1910s-1930s, and from the m-1926 mackinaw worn by the Army and the Civilian Conservation Corps before the war. It is a double breasted style, with a broad shawl collar, epaulettes, and a belted waist. The coat is fully lined with an interior breast pocket.

Chest (pit to pit): 21″ (doubled = 42″)
Shoulder to shoulder: 19″
Sleeve (shoulder to cuff): 24-1/2″
Length (base of collar to hem): 33″