Some of the more fashion-forward details are slimmer cuts, brass buttons and whipstitching.
From the usatoday.com
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A sewing stitch passing over an edge diagonally
(WHIPSTITCHING) To sew a book's leaves by passing the thread over and over the spine; often seen in early pamphlets.
Stitching through holes usually punched along the binding edge of a text block. Sewing thread passes into the top and out of the bottom of each hole in succession to attach the leaves. Library binders whipstitch new endpapers to oversewn and side-sewn text blocks in preparation for re-casing.