Simplicity 5996 vintage sewing pattern, dated 1965. 

Misses' One-Piece Dress - (Including Simplicity's Personal-Fit Tissue Chart):

Dress with an A line skirt has back zipper, neck band and tie belt. V. 1 with short set-in sleeves has contrasting belt and piping. Sleeveless V. 2 has contrasting neck band & belt. Sleeveless V. 3 skirt & belt contrast bodice, neck-band contrast bodice. Pattern includes and extra feature for those who require personal-fit at waist and hip. The waist and hip can be made larger (or smaller) than the regular size of this pattern. 

Size  16:

Bust  36 inches / 92 cm

Waist 28 inches / 71 cm

Hip    38 inches / 97 cm

Pattern is PRINTED, cut and checked complete. Personal Fit tissue lesson sheet is included. Envelope is in very good vintage condition, with a small hole on the front cover.

More '60s patterns here:

http://allthepreciousthings.com/collections/1960s