Simplicity 5318, c. 1972. Dress, Bikini Pants and Bell-bottom pants - Young Contemporary Fashion (approximate dress length 29"). The flared dress with princess seaming has back zipper, low round neckline, two-piece bell sleeves and optional self-fabric bow or button trim. The bell-bottom pants have elastics waistline casing. The lined bikini pants have elastics casings at upper and leg edges.