diploïdion

Century Dictionary and Cyclopedia

1. n. In anc.Gr.costume: A particular form of female chiton or tunic, in which the garment is double from the shoulders to the waist, the outer fold hanging loose, like a sort of sleeveless mantle.
2. n. More rarely, a separate garment so disposed over the chiton as to give the whole arrangement the appearance of a single piece.