1.NounA lightweight, balanced plain-woven sheer fabric, or gauze, like gossamer, woven of alternate S- and Z-twist crepe (high-twist) yarns made of silk, polyester, or cotton.
"Her dresses are made from these marvelous chiffons."
2.NounAny purely ornamental accessory on a woman's dress, such as a bunch of ribbon, lace, etc.