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.
Vegetable Flannel. A material made from pine leaves. When spun and woven the thread resembles hemp, and is made into articles of underclothing; the latter keep the body comfortably warm and are very solid. Blankets are also made of this material, and are exclusively employed in the hospitals, barracks, and prisons of Germany. One of their principal advantages is that they harbor no vermin. The fabric is woven in no other city except Breslau, Germany, where there are two establishments devoted to their manufacture.