Over the last couple of Summers, women's one piece bathers have featured saucy cut out sections for the slim, brave/fool hardy among us. You need to have the body of a model to pull that look off as you can see here.
Image from the 1929 annual of The Draper of Australasia
Smokin' hot or what? The Melford suit was also available in black trimmed with two red lines around the bottom hem which looked even smarter. No really!
You can feel the heat radiating from the glowing face of this Adonis.
In all seriousness though he is a buff chap/trio with fine pins!