In 2008, school officials in Basel, Switzerland, ordered a Muslim couple to enroll their daughters in a mandatory swimming class, despite the parents’ objections to having their girls learn alongside boys.
The officials offered the couple some accommodations: The girls, 9 and 7 at the time, could wear body-covering swimsuits, known as burkinis, during the swimming lessons, and they could undress for the class without any boys present.
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source: https://www.nytimes.com/2017/01/10/world/europe/swiss-muslim-girls-must-attend-swim-classes-with-boys-court-says.html?_r=0