Simplicity 4001; ca. 1961; Slenderette - Misses' and Women's One-Piece Dress in Proportioned Sizes: Dress has slightly lowered neckline, button closing on bodice front, short set-in sleeves, left side zipper closing and four gore skirt. Boning is used in front to keep neck edge firm. V. 1 has a collar and ribbon tie belt. Collarless V. 2 has optional top-stitching detail and self belt or contrasting sash.