Chiffon is derived from a French word that mean 'cloth or rag'. It is a lightweight, plain-woven sheer fabric. Chiffon fabrics are woven of alternate crepe (high-twist) yarns. The twist in the crepe yarns puckers the fabric slightly in both directions after weaving, giving it some stretch and a slightly rough feel.
Chiffon is not a material
This would come as a surprise to some, but Chiffon is not a material. Chiffon is the way the cloths is made. So that means that Chiffon can be made of silk, nylon, polyester, etc. Early days Chiffon was made purely of silk. That all changed with the advent of artificial fibers.
Chiffon is used often in blouses, lingerie and other evening wears.
These are light-weight fabric and can be difficult to work with. Delicate care means it's advisable to hand wash any chiffon fabric.