This is Stretch & Sew 1310, One Piece Halter Swim Suit sewing pattern, published/copyrighted in 1974. It was designed by Ann Person and designed exclusively for knit fabrics. This sewing pattern is unique in that it is printed all on one piece of paper (template & instructions) and not in an envelope like most of Stretch and Sew patterns are.
30, 32, 34, 36, 38 and 40.
The paper has wear and a couple of small tears on the folds. There is a store stamp on the front and some minor foxing on the inside areas. Overall good vintage condition, everything is still readable.