Simplicity 6415 vintage sewing pattern, dated 1974.
Maternity Halter Dress in Two Lengths or Bathing Suit in Misses' Sizes (Approximate length of short dress is 36"):
The halter dress V. 1 & 2 or the bathing suit top V. 3 with skirt gathered to bodice above normal waistline have back zipper, sweetheart neckline, shoulder extensions tied at back neck and option top-stitching and button trim. V.1 is short length. V. 2 is ankle length. The lined bathing suit shorts V. 3 have elastic leg casings and adjustable elastic waistline casing.
Size 10:
Bust 32.5 inches / 83 cm
Waist 25 inches / 64 cm
Hip 34.5 inches / 88 cm
Pattern is uncut and factory folded. Pattern envelope is in very good vintage condition.
More '70s patterns here:
http://allthepreciousthings.com/collections/1970s
