I recently made 2 WWII Era WASP hats for the Arizona Commemorative Airforce Air Base Museum in Mesa, Arizona. The beret is based upon a pattern I developed a few years ago and is made of wool. The cap is based upon images I was able to locate from period photographs and one other museum display photo. The cap is made of blue denim cotton.
Image source: http://wings1944.blogspot.com/
The hats were commissioned for display in the museum’s gift shop.
Source: Jill McLane Baker/Kalamazoo Gazette, July 17, 2010