Dupioni is a type of simple weave silk fabric with fine thread used for the warp and coarser thread used for the weft.
Dupioni (also Douppioni or Dupion) is a woven silk fabric with a textured finish from the crossing of the smoother warp threads with coarser weft threads. The weaving process gives the fabric an iridescent look but not as iridescent as silk taffeta.
It is heavier than Shantung and both are used for formal wear. Because it is heavier, though, Dupioni is commonly used for in draperies, bedspreads, and pillow shams.
Dupioni gives you the luxury of silk with the durability of heavier fabrics.