The B-1 Suit served as a staple utility garment for U.S. military mechanics from the 1920s until 1941. Though issued under several specification numbers, variations were minor - mainly involving subtle shifts in the shade of herringbone twill fabric or slight button design differences. A notable characteristic of all B-1 models is the asymmetrical chest pockets, thoughtfully designed to securely hold tools or parts regardless of the wearer's movement.

Crafted from lightweight, olive drab herringbone twill fabric, the B-1 was unlined to allow easy mobility during mechanical tasks. Durable reinforced stitching and button-front closures provided resilience, while wide-legged trousers accommodated wearing over boots or layered clothing. This straightforward yet practical design reflects its function as reliable workwear.

Originally developed for the U.S. Army Air Corps mechanics, the B-1 also saw use during flight training and among various ground support personnel. Initially an Air Corps exclusive, production transferred to the Army Quartermaster around 1933 due to budget constraints during the Great Depression. By 1938, a nearly identical garment, the M-1938 suit, was introduced by the Army. Although visually similar, the M-1938 can be identified by the distinct Army 13-star metal buttons and is believed to be directly inspired by the original B-1.

The Real McCoy's TYPE B-1 MECHANIC SUIT is constructed from 100% cotton herringbone twill, featuring donut riveted buttons and cotton sewing thread.

100% Cotton Herringbone Fabric

Cotton Name Tape

Donut Riveted Buttons

Chest Pockets

Belt Fastening

Cotton Sewing Thread Construction

Period Correct Enamel Application

Made in Japan