Butterick 3026 vintage sewing pattern, dated circa 1973.

Misses' Bikini & Cover-Up.

Bikini, for stretchable unbonded knits only, has seamed cups held together with purchased ring and narrow straps crossing in back and tied through side rings. Bikini bottom with elasticized upper and leg edges is held at sides with purchased rings. Cover-up has high-waisted fitted bodice with round neckline, front zipper closing, three-quarter or full-length set-in dolman sleeves, attached self ties, gathered skirt with patch pockets, and topstitch trim. 

Size      6:

Bust    30.5  inches / 78  cm

Waist    23 inches / 58 cm

Hip     32.5 inches  / 83 cm

Pattern is partly cut and checked complete. Envelope is in good vintage condition, with light shelf wear, sticker mark on the front.

More '70s patterns here:

https://allthepreciousthings.com/collections/1970s