Simplicity 5459; ©1964; Misses' Jiffy One-Piece Dress or Jumper: Simple to Sew. The loosely fitted dress has a scooped neckline, front underarm darts and slit openings in side seams. Back laps over front at shoulders fastening with buttons. A self fabric tie belt may be worn. V. 1 features a patch pocket and top-stitching trim. Self fabric bow accent slit openings in V. 2 dress.