KelownaMuseums - During the 1940s, a change in fabric manufacturing revolutionized bathing suits by giving them more elasticity. Men's swimsuits lost their tops, leaving behind high-rise briefs that covered the belly button.
1940s Young Men Muscular Hunk Bulging Swim Suit Beach Leisure Fun Photo Gay Int | eBay
Vintage photos show 100 years of swimwear in Sonoma County