Dupion
A crisp silk with a slightly uneven, slubby thread, made from double cocoons that two worms have spun together.
Also: dupioni, douppioni, dupion silk
Sometimes two silkworms spin a single cocoon together, and their threads tangle. This double cocoon cannot be reeled into a smooth filament, so the thread comes out thick in places and thin in others. Cloth woven from it, called dupion, has small irregular slubs, a crisp hand and a shine that changes with the angle of the light. It holds its shape well and is used for blouses, sarees and furnishing. The word comes from the Italian doppione, meaning double. In India dupion is made in several silk areas.