This vintage jacket was made in the USA by Melton, under their Wintermaster line. The overall lines of the jacket, with its two tone styling, unlined construction, pocket setup and back belt adjusters all suggest the 1940s or early 1950s, but the hardware points to a date of manufacture no older than the 1960s. This is probably a model that was kept in their product line with no major changes for a long time.
Chest (pit to pit): 23″ (doubled = 46″)
Shoulder to Shoulder: 19″
Sleeve (shoulder to cuff): 23-1/2″