http://www.ebay.com/itm/271772739718
This vintage mackinaw coat was made in the late 1930s for Sears under its Hercules label. It is wool plaid in a double breasted cut, with handwarmer pockets and flapped cargo pockets. As is typical of these earlier production mackinaws, it is unlined.

Chest (pit to pit): 21-1/2″ (doubled = 43″)
Shoulder to shoulder: 17″
Sleeve (shoulder to cuff): 24-3/4″
Length (Base of collar to hem): 30″