Simplicity 6023 vintage sewing pattern, dated ca.1965.

Maternity One-Piece Dress in Misses' Sizes:

Maternity dress with let-out side seams has lowered round neckline, collar and back zipper closing. V. 1 with short set-in sleeves has rick-rack and button trim. V. 2 with short set-in sleeves has self fabric bow. Sleeveless V. 3 has contrasting collar & ribbon bow.

Size 12:

Bust 32 inches / 81 cm

Waist 25 inches / 64 cm

Hip 34 inches / 86 cm

Pattern is UNPRINTED, factory pre-cut tissue pieces with perforated symbol markings, checked complete. Envelope has a store stamp and a handwritten name on the front.

More '60s patterns here:

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