Blue denim work clothing was adopted as the standard by the U.S. Army in June of 1919, replacing the brown work clothing that was used before. The top was a pullover style jumper, accompanied by a five pocket pant and the Denim Army Hat, better known as the Daisy Mae. In 1933, a one-piece work suit made of blue denim was adopted for use by mechanics, drivers, machinists, and others in similar roles. The pullover denim jumper seen here and used by the U.S. Army as fatigue wear originates from the brown denim jumper adopted in 1908 as part of the Army’s first denim workwear. This blue denim version, with spec number 6-125, was redesigned with a more relaxed fit to address the difficulty of putting it on and taking it off, achieving a balance of productivity and durability. Adopted in 1919, it continued as a standard Army issue until 1940. During this period, it was also issued to young men participating in the Civilian Conservation Corps (CCC), a job relief program during the Great Depression. This jumper was intended as part of a set with the hat and trousers. Many of these were repurposed for CCC use, and some were even produced specifically for the CCC, identifiable by contract numbers prefixed with "ECF." The attached NRA label was applied only for a single year, in 1934, under government directive. The NRA (National Recovery Administration) was an agency established to enforce the National Industrial Recovery Act (NIRA), part of the New Deal legislation enacted in 1933. This label served as proof of compliance with the NIRA. 100% Cotton 10 oz. Unbleached Color Weft Denim Tinplate Buttons Cotton Sewing Thread Construction Made in Japan