Yes, that's right: fully bare. No skimpy speedos, swim trunks, or even underwear; and usually no hair caps or swim goggles. The prevailing masculine ideal of the time viewed modesty with suspicion or even contempt. Young men were expected to conform and not complain about their privacy. This little known historical fact seems incredible or outrageous to modern American sensibilities, but America's strapping young lads used to grow up swimming in the buff.