The HWM woes could easily be rectified with a slight change to the back seam. It should be done like my excelled, and they could easily ditch the faux Halfbelt that the excelled has.Everyone keeps forgetting that it is an 80s pattern marketed as a 50s pattern. Once you accept it for what it is, it looks the part. Well done!
Comparing the HWM back seam construction at the side panel (this jacket fits nothing like a Halfbelt):
Aero’s straight diagonal:
Doing this would alleviate the balloon appearance some HWM jackets end up with. I don’t see this in @Mich486 example but his is the exception, not the rule