Peplos

A peplos (πέπλος) is a body-length Greek garment worn by women dating to before 500 B.C.

The peplos is essentially a tubular cloth, folded inside-out from the top about halfway down, so that what was the top of the tube is now the waist and the bottom of the tube is about ankle-length. It is then gathered about the waist, and the open top (at the fold) pinned over the shoulders. The top of the tube (now inside-out) drapes over the waist providing the appearance of two pieces of clothing.

A good picture is located at http://www.classics.cam.ac.uk/Museum/peplostext.html.