Woolen fabric is a type of fabric made from wool, which is a natural fiber obtained from sheep. WORSTED is a type of woolen fabric that is tightly twisted and combed to create a smooth finish. Serge is a twill-weave fabric with a smooth, even surface. FLANNEL is a soft, lightweight woolen fabric with a napped finish. Casha is a lightweight woolen fabric with a slightly fuzzy texture. Tweed is a rough, thick woolen fabric with a distinctive pattern. Prunella is a heavy woolen fabric with a slightly rough texture.