Yes, but it might be counter-intuitive - lower / larger armholes actually restrict movement more rather than improving it. In my opinion high armhole jackets are objectively better as long as you don't go too high to start pinching and pushing up your armpit.
IH may be one of SB’s biggest clients (if not their biggest) and so it is easy to see how they might take extra good care of them while not paying the same attention to a customer ordering a single jacket.
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