One of our tasks this year was to copy this vintage military coat. The original had a label from 1953, and was in fair condition- a few moth holes here and there, and it was missing it's button-in lining. The reason we couldn't use it was size- it is a size 38R and we needed a 46 tall.
I took notes and a few photos because I find that there are so many interesting details and frankly wonderful engineering on some of these vintage garments that you don't see anymore.
Some details were things that we didn't need to reproduce- the button out lining for one, as well as the type of armhole and resulting sleeve. The armhole dropped about 2" below the usual point, into a V shape. The sleeve had an underarm seam and a back seam but no front seam, and a correspondingly odd shape at the underarm to accommodate the V plus it had a grown-on gusset.
Below is our version- a lot longer proportionately than the original because the designer wanted calf length on a man 6' 5" tall. We also took the belt buckle and button from the vintage coat to use on the new one. All in all, a satisfying result.