http://www.ebay.com/itm/271570239228
This vintage mackinaw was made pre-war for either the US Army or for the Civilian Conservation Corps. It is double breasted, with a shawl collar, epaulettes, buttoned cuff adjuster belts and flapped patch pockets. It is unlined with taped seams, a hallmark of the early production versions of this coat.

Chest (pit to pit): 22″ (doubled = 44″)
Shoulder to shoulder: 18″
Sleeve (shoulder to cuff): 26″
Length (base of collar to hem): 34″