Source : Webster's Revised Unabridged Dictionary (1913)

Chiffon \Chif`fon"\, n. [F., lit., rag. See {Chiffonier}.]
   1. Any merely ornamental adjunct of a woman's dress, as a
      bunch of ribbon, lace, etc.

   2. A kind of soft gauzy material used for ruches, trimmings,
      etc.

Source : WordNet®

chiffon
     adj : as thin and soft as chiffon; "chiffon taffeta"

chiffon
     n : a sheer fabric of silk or rayon