Is swimming in underwear acceptable instead of costume in swimming

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My eleven year old son went to the swimming pool and forgot his togs. If he is comfortable is it okay for him to swim in his underwear? - Quora

Why don't people wear clothes when they swim in public pools or beaches? What are the consequences of not wearing clothes while swimming in public? - Quora

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Are you supposed to wear underwear under men's swim trunks? If so, which type? - Quora

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

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

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What type of clothes are allowed in a public swimming pool in Canada? - Quora

Swim Attire, Student Life