Sferra recently sent us a great explanation on this popular accent to bed linen pieces:

A flange is a classic decorative accent, typically added along three sides of a duvet cover and on all four sides of a pillowsham. A flange extends beyond the dimensions of a duvet or sham, creating a large, elegant flourish. The finest linens use flanges, as well as hemstitching, to create the signature look and soft drape of luxury bedding.

Here are some examples of flanges:

When looking at measurements of duvet covers and shams, remember that they are of the interior of the piece.  The overall dimensions will be larger, to include the flanges on the outside.

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