This section is from the "A Complete Dictionary of Dry Goods" book, by George S. Cole. Also available from Amazon: A complete dictionary of dry goods and history of silk, cotton, linen, wool and other fibrous substances,: Including a full explanation of the modern processes ... together with various useful tables.
Fur Beaver. A term applied in recent years to a variety of heavy, napped woolen cloth used exclusively for men's fine overcoats. The cloth is double-woven, with the warp in the center and a weft on each surface, made of extremely soft, fine wool, such as lamb's-wool or merino. The face is finished with a straight flowing nap, not being rolled into tufts as in Chinchilla, but brushed straight and all lying in one direction. The principal advantage of Fur Beaver is that being woven of extremely fine wool, it produces a light fabric, thus preserving great warmth with very little weight. It has a soft, almost oily feel, similar to beaver fur, and is often finished with a short nap on the back.