Simplicity 4920 vintage paper sewing pattern, dated 1963.

Misses' One-Piece Dress:

The princess line dress has a lowered round neckline, inverted pleats at lower edges of side front and side back seams, a button-and-loop closing at center back neck edge, and a zipper closing in left side seam. V. 1 has short set-in sleeves and pockets with button trim. V. 2 is sleeveless and has bow trim. V. 3 is sleeveless and has a self-fabric tie belt. 

Size      12:

Bust     32 inches / 81 cm

Waist   25 inches / 64 cm

Hip      34 inches / 87 cm

Pattern is unprinted tissue, checked complete. Envelope is in good vintage condition.