The shoulder width saga with Aero is indeed very, very confusing. I see stock jackets on their sale page in a size 42” with what look like 38”-40” shoulder widths (17.5”-18.5”). I measured my wool Halfbelt, a size 40”, and it measures dead on 18.5”. The p2p is nearly 24”. For all intents and purposes, it should be a very odd fit but it’s not. It’s actually pretty near ideal. I do wonder if Aero has intentionally decreased the shoulder width across the entire range.I’ve been emailing back and forth with Holly and the one remaining question is shoulder width. I’m a fairly proportional size 38 in most regards, with a 17.75” shoulder. But in this model the 38 comes with a 19.5” shoulder! They are willing to cut it down to 18.5” but advising against going so far from stock sizing.