Simplicity 6999; ©1975; Dress or Jumper in Two Lengths and Shirt-Jacket in Women's and Half Sizes ... Look Slimmer: The long or regular length dress or jumper has low round neckline, back zipper and may be worn with self fabric tie belt. The shirt-jacket with shirt type collar has front button closing, long set-in sleeves gathered to buttoned cuffs and curved slits in side seams.