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