Stitches for the back are cast on gradually to form the curved lower edge; the back is larger than the front, and the front is straight and unshaped along the lower edge. Stitches for the bottom edging are picked up after the front and back have been sewn together. The back is wider at the lower edge than the front; decreases at sides shape the back so both pieces are the same width below armholes. The eyelet and garter rib patterns are different on the front and back.