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. In 1933, a one-piece work suit made of blue denim was adopted for use by mechanics, drivers, machinists, and others in similar roles. Perhaps the most notable though was the Denim Army Hat, better known as the Daisy Mae, affectionately named after a comic-strip character of the period. The form derived from bucket hats worn by fishermen and provided exceptional utility through its wide wrap-around brim and durability.

As the use of denim was discontinued prior to WWII, the Daisy Mae was replaced by the light green HBT hat and the design evolved into the more elaborate Boonie Hat. Surplus stock was issued to POWs throughout WWII.

Distinguished by white stitching to the brim and a six-piece crown construction.

The 10 oz. Denim is reinforced internally with Herringbone cotton tape.