DSA 100-74-C=1317. 60% Polyester, 40% Wool. The Vintage USAF Blue Dress Uniform Wool Hat is a Garrison Cap with a Flight Ace Cap design, in size 7 1/8. This Air Force uniform hat was made in the United States and is a collectible piece of militaria from an unknown date. The uniform signifies a connection to the Air Force, with a classic design that reflects the military theme of the item.