http://www.ebay.com/itm/401022052057
This vintage jacket was made in the 1930s by Knockabout. It is made of mackinaw wool, with a pleated, half belt back, low slung side adjuster belts, a grommet pin-lock Crown zipper, button adjuster cuffs, leather trim on the pockets. As is typical of these early work jackets, this one is unlined. The unusual coil zipper on the breast pocket was made by Nu-Zip

Chest (pit to pit):25″ (doubled = 50″)
Shoulder to shoulder: 19″
Sleeve (shoulder to cuff): 22-1/2″
Length (base of collar): 24″