Simplicity 6538; ©1966; Misses' One-Piece Dress with Three Necklines: Slim, dart fitted dress has back zipper. V. 1, 2 & 3 feature short set-in sleeves. V. 4, 5 & 6 are sleeveless. V. 1 & 4 have lowered round neckline. V. 2 & 5 neckline is lower than V. 1 & 4. V. 3 & 6 have V-neckline.