The vintage leather flight jackets come in many tiers of badassedness, based on price and true to original design. Eastman, Aero, Real McCoy are probably close to the top. Lost Worlds is serious hi dollar shit and sell everything from flight jackets to vintage motorcycle jackets, vintage shirts, jeans, etc.
I have never handled one of these jackets, but they appear to be a pretty good flight jacket at a moderate cost. The designs are not going to be true to spec like an Eastman or Aero, but are pretty accurate.
http://www.flightjacket.com/