Butterick 6537; 1970s; John Kloss. Swimsuit, bikini and skirt. One piece halter swimsuit with under bust seaming and halter bikini top have V neckline, attached self loop trim, attached self straps that drawstring at back and elasticized edges. Swimsuit has lined crotch. Bikini bottom has elasticized waistline, shaped hemline slit. Skirt can be worn with drawstring at front.,