Do girls from Europe often swim in underwear? Do they not mind strangers seeing their bras?

I know this girl from Europe and she often goes swimming in her bra and panties if she forgets her swimwear or just feels like it. She doesn't appear to mind being seen in undies or having to wear a wet bra under her clothes all day. She even does it in lunch breaks often and returns to class with wet bra marks on her top.

Do girls from Europe often swim in underwear? Do they not mind strangers seeing their bras?
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