many repro makers take great pains to source original a-2s to make their patterns. the problem is, many originals have shrunk disproportionately over the years. thus making a pattern from an original has its ups, [ie: where things go, and how they go there, visual clues, and the shape of panels, pockets, flaps,, etc.] and downs, ie: hide texture, color, and measurements. my experience has shown me that for the most part, a-2s were symetric in measurements. that is to say, a size 40 would have a pit to pit measurement of 22", sleeve length from the shoulder seam to the end of the leather sleeve [not including the cuff] 22", back length from the collar seam to bottom of the leather back [not including the waistband]: 22". for a size 42 the measurements would be an additional 1"[ 23"x23"x23"] , and so on. there are variations to this formula such as some dubows, and aeros sometimes seen as being 1/2" shorter in body length, and stars, and donigers often being 1/2" longer in body length. admittedly, my conclusions are based on observation, and handling originals.