http://www.ebay.com/itm/281596533672
This vintage jacket was made in the 1920s-mid 1930s. It is what was then called a stag coat, a variant on the mackinaw coat. It is single breasted, with patch pockets and a fold over collar. It has a double back, and is unlined.

Chest (pit to pit): 22″ (doubled – 44″)
Shoulder to shoulder: 17-1/2″
Sleeve (shoulder to cuff): 25″
Length (base of collar to hem): 29″