This is a wonderful illustrated Jantzen ad from 1959. What is find intriguing is the buttoned shoulders. These were very popular in the 1960s but this ad shows us that they were around in the late 1950s.
Ad text reads " Flowers of Hawaii inspire two exciting, exotic prints for two exciting, exotic swimsuits that do wonderful things for a body. left, 'rose water' elasticized cotton faille $14.95 ($112.00 in today's dollar). Right, 'self portrait'' fabulous Helenca with the Jantzen secret weapon, separate French bra cups that work miracles $25.00 ($187.00 in today's dollar). Jantzen artichoke swimcap in collaborating colors $4.98 ($37.31 in today's dollar).