http://www.ebay.com/itm/271371265923
This vintage army mackinaw was made in 1942. It is made of doeskin wool in a double breasted, shawl collared, belted mackinaw style. The spec tag identifies the official name as the Officer’s Short Overcoat, and the size as a 38 Long. One of the buttons on the belt is missing, but replacements for this model coat are easily found.

Chest (pit to pit): 21-1/2″
Shoulder to shoulder: 19-1/2″
Sleeve (shoulder to cuff): 25″
Length: 34″