The Army Air Force was part of the US Army and the USAAF uniforms were the same as the Army uniforms. The only visible difference was the shoulder sleeve insignia (SSI) & technical specialities patches and a wing.
The officer's winter service dress uniform is perhaps the best known example, together with the drap No. 54 color trousers. This combination became an American classic which is known as the "Pinks and Greens". The tunic was made of olive drap wool (No. 51). The trousers intended to be worn were the Pink trousers (No. 54) or the green trousers (No. 51) which matched the tunic. The summer uniform was kaki color made of cotton, gabardine, tropical worsted, etc. This uniform wasn't mandatory as opposed to the winter dress. Most officers had their uniforms tailor made but Army regulation uniforms were available at the PX.
Other uniform types saw active service with the USAAF and were worn as often as the Pinks and Greens, Ike jackets. These jackets were modelled after the British battle dress. General Dwight D. "Ike" Eisenhower popularized the jacket within the US Army during WW II. These jackets could be tailor made or cut down from a service coat. Later on, the USAAF standarized her own Ike jacket, the B-13 officer's jacket and the B-14 EM jacket.
The EM wore a green wool serge uniform, a bit lighter than the officer's coat. The trousers matched the color of the tunic. Just like the officers, EM purchased also Ike jackets or ETO jackets. This was a common practice for overseas stationned crew.
As the USAAF was less strict regarding clothing regulation, a whole variety of patches were worn. This could be cut-edge US made patches, felt , bullion, ...