http://www.ebay.com/itm/281511678501
This vintage mackinaw coat was made in the early 1930s. At the time of its manufacture, this single breasted plaid mackinaw style, with its A-1 style patch pockets and shirt collar, was known as a Stag Coat. It has a double yoke back for a bit of extra warmth, and like many early mackinaws, is unlined.

Chest (pit to pit): 21-1/2″ (doubled = 43″)
Shoulder to shoulder: 18-1/2″
Sleeve (shoulder to cuff): 22-1/2″
Length (base of collar to hem): 28″