What's the most versatile A2 leather jacket contract repro?
Do yourself a favor and visit Acme Depot and decide whether you want a modern or vintage style A-2. They are really two different styles of jacket.
With the vintage version you'll need to remember that they are made to mid-forties style of wear, which means high-waisted and a closer fit. Aero is especially strict in this regard, plus they of course size English.
The Cockpit's quality has become more consistent with their acquisition of Avirex.
Another quality maker is Gibson and Barnes/Flightsuits Inc. Like Cockpit most of their stuff is chemical tanned so the leather has an automotive feel.
Once you go Good Wear you won't want anything else, though...
On the other hand, fit can be hella tricky with A2s cause they were originally cut for rail thin dudes about 5"7", 120lbs, with pants hiked up just below their naval (or higher!!). If the A2 is true to original it's gonna feel pretty short. Accordingly, you may actually be better off going with a maker that doesn't give a crap about NOS triple mark Talon zippers, or stitch pattern on the epaulets and save yourself some serious dough.