Or yūki-tsumugi, a 17thC Japanese silk spinning, dyeing and weaving technique, producing pongee for kimonos that were traditionally worn by farmers and samurais; it is now a Unesco Important Intangible Cultural Property.
Tsumugi is hand woven with pre-dyed yarn spun in uneven thicknesses from hatched and double cocoons, resulting in a warm, soft, uneven, rustic but sturdy fabric in natural colours–very attractive in interior furnishings, and the japans equivalent of what we often call dupion or douppion