My great uncle was a pilot or flight crew in ww2.  When my grandfather died, I was cleaning up his stuff and I found a box with my great uncles name on it.  There was mostly junk in there, but there was a leather jacket, I guess it was a flight jacket, with some weird crap on the back, and a pair of leather mittens with a thumb AND finger, and were fur lined.  I kept it, but don't know if it's worth anything.
I doubt I'd sell it anyway, it's neat.  None of my family knows much about him, since he died young.  Not in combat, though, after the war.