This advertisement appeared in the November 1817 issue of La Belle Assemblée.

Young woman wearing a Welsh whittle (c) Shipley Art Gallery; Supplied by The Public Catalogue Foundation
Cambrian flannels were woven in Welsh wool mills in the Cambrian Mountains. A Welsh whittle is a type of shawl common in southwest Wales, typically featuring a short fringe on both ends and made of fine wool (whittle | Welsh Costume / Gwisg Gymreig)