Simplicity 5701 vintage sewing pattern, dated 1974.

Maternity Short Dress or Tunic and Pants in Misses' Sizes:

The tunic V. 1 or short dress V. 2 & 3 with front and back yokes has back zipper. V. 1 & 2 with patch pockets are sleeveless. V. 1 with contrasting yoke and pockets has rick-rack trim. V. 2 has flat woven braid trim. Top stitched V. 3 has short set in butterfly sleeves. Pants V. 1 have elastic waistline casing. 

Size  12:

Bust  34 inches / 86 cm

Waist 26 1/2 inches / 67 cm

Hips  36 inches / 91 cm

Pattern is partly cut and checked complete. Pattern envelope has several large tears.

More vintage maternity patterns here:

http://allthepreciousthings.com/collections/maternity