From looking at images of the “Flying Tigers”,
I wondered why there was no consistency with the jackets worn by the pilots.
Then I read, A Flying Tiger’s Diary by Charles R. Bond Jr.
He explains that most jackets were bought at civilian places by the pilots.
I also found interesting the variety of footwear from boots to brogans
that these guys wore.
The Chinese government did buy a large supply of Flight cloths for the AVG. They contracted with Willis & Geiger, for flight suits, helmets and M442A jackets, all navy equipment. Apparently, the recruiters told Army pilots to bring their dress uniforms, and told the Navy pilots not to! That's why you see the Army personnel in Pinks & Greens, with Chinese buttons and the Navy in British style bush jackets.