Yeah I know what you mean, you can see where the stitching on the real jacket goes down the armhole, it goes very vertically down for quite a long way, the arm holes are very wide on the real one basically.
If we want the suede back to be wider, ideally the armholes would have to be altered too.
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The stitching runs down the suede and then under the armpits onto the lycra section, so the armholes need to follow the same line as that suede coming down, the stitching all runs in a line from suede to lycra. And that suede is meant to come down in a straight line. Urgh this is a mind**** to explain in words lol I'm wondering whether to even ask them to make the back suede wider, because it might mess things up.