Here's a cute article on the reaction to the just evolved fashion of the topless bathing suit, in 1965.

How can one go topless and yet wear a bathing suit? Find out.

Beware, the fashionable items of swimwear and lingerie described are not for the fainthearted. Lets say, going nude would be considered prude if you go by what was worn by the fashionable in 1965!