There was this:-I wasn't there for that discussion way back when, but if the only evidence for it being a PX jacket was that it had the weird back seam, then that seems like pretty scanty evidence to me.
Thread 'G-1 PX Purchase Jackets: Are They Military or Civilian?'
Thread 'My anomalous new G-1'
Note input from Porkchop, former Naval supply officer. And the date-2008!