While I’m certain that I lack the tailoring nomenclature to describe exactly what’s going on, here is a pic of 3 different pattern’s back lining panels. All size 40. All 3 of these jackets have very generous upper sleeves, very similar shoulder width, and pit to pit numbers. Cafe racer in the center definitely has the highest armholes of the 3. This pattern has a more aggressive “arms forward” position for riding where most of the upper sleeve is distributed through the side panel and into the front bodice panel. Very similar to a J-100 feel. Pattern on the right fits more in line with a standard Highwayman type. So maybe the proper answer is sleeve placement?


