Simplicity 6921 vintage sewing pattern, dated 1975.

Misses' Jiffy Shawl and Reversible Bias Bikini:

The bias bikini bathing suit has shorts with elastic casings at upper and leg edges and halter type bra with self fabric drawstring slipped through casings. The shawl has fringe trim. 

Size   10: 

Bust   32.5  inches / 83 cm

Waist 25 inches / 64 cm

Hip    34.5  inches / 88 cm

Pattern is partly cut and checked complete. Instruction sheet has a tear; one small piece has a tape repair, not affecting use. Pattern envelope is in good vintage condition, with a store stamp on the front and flap removed from opening.

More '70s patterns here:

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