Aero A-2, Eastman Luftwaffe, McCoy's 1939 Dodger's jacket.
I've listed a few items on eBay which may or may not garner your interest:
Aero Leather goatskin A-2 jacket
Eastman Leather horsehide Luftwaffe jacket
Real McCoy's 1939 Brooklyn Dodgers jacket
You can find 'em through my ebay user name: whistlejerk2rn9 .
It varies from manufacterer to manufacterer, usually a 38/40. I am 5' 11" and 155 pounds. The McCoy's jacket is way too big on me and probably suited best for one who takes a size 42, the Luftwaffe jacket is slightly too short in the arms for me and is probably best suited for a size 38 short, the Aero A-2 fits great (would fit a size 40 as well), but I can no longer justify owning 5 A-2s when I need to buy a new camera and computer.