The square sleeve cap is one of those Forties styles that makes appearances every now and then. It introduces design into the cap of the sleeve.
Its mitered, box-like appearance extends the shoulder line into the sleeve cap and adds to the sleeve bicep, which makes it a good candidate for fitting a jacket, where a small armhole is desired but the wearer has a developed bicep, and needs more room in that area of the sleeve. The miter helps finesse any extra cap ease that would be added to accommodate the fuller bicep.
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