Is swimming in underwear acceptable instead of costume in swimming

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Would males wear underwear as swimwear at the local pool? If so, what kind and age? - Quora

Do Swimmers Wear Underwear Under Swimsuits? And Why You Never

Do Swimmers Wear Underwear Under Swimsuits? And Why You Never

The Guys Who Wear Underwear Under Swim Trunks Think We're the

Plus Size Leopard Strap High Waist Swimsuit, Two Pieces Swimming

Can teenage boys swim in underwear at the beach? - Quora

Competitive swimwear - Wikipedia

Do people wear underwear for swimwear? - Quora

Can you wear underwear with swim trunks? - Quora

Is it okay that I (M14) got hard at the swimming pool when I saw lots of young girls (3-14) in swimsuits and bikinis? - Quora

Do people in Europe generally swim with underwear/swimsuits or without them at beaches and pools? - Quora

I don't have my swimming trunks with me. Is it okay if I swim only with my tighty whities in the hotel pool? - Quora

Do Swimmers Wear Underwear Under Swimsuits? And Why You Never

Speedos: Beachgoers beware, men's tiny swim briefs are back in