You just might want a panty brief from Playtex.
Yes really, a girdle for your swimsuit. And 'As seen on TV'. That's right, turn your swimsuit into a SLIM suit.
The ad copy reads:
For a slim, sleek, whistle provoking figure under bathing suits and all summerwear, try a Playtex panty Brief. Fits like a second skin...makes you look inches slimmer instantly...and goes in and out of water as gaily as your bathing suit. Dries in a wink too! The secrets in the new material, Fabricon...a figure slimming blend of downy soft cotton and stretchy latex.