Simplicity 6295 vintage sewing pattern, dated 1974.

Maternity Short Dress or Top and Pants in Misses' Sizes (Approximate Length of Dress in 35"):

The dress V. 1 or top V. 2 with skirt stitched to bodice above normal waistline has back zipper, "V" shaped neckline, short set-in sleeves with contrasting button trimmed cuffs, contrasting collar, self fabric tie ends and optional button trim. The pants V. 2 with elastic waistline casing has front stay of nylon or cotton jersey or a purchased maternity stretch panel may be used. 

Size   12:

Bust   34 inches / 87 cm

Waist 26 1/2 inches / 67 cm

Hips   36 inches / 92 cm

Pattern is UNCUT and factory folded. Pattern envelope is in very good vintage condition.

More vintage maternity patterns here:

http://allthepreciousthings.com/collections/maternity