My parents came to Australia as refugees, fleeing Nazi persecution after Hitler annexed Austria. They arrived in a country eager to assimilate immigrants into its dominant Anglo-Irish culture. When my parents spoke German on a tram, they were told: "We speak English here!"

Assimilation of that kind has long disappeared from Australian government policy, replaced by a largely successful form of multiculturalism that encourages immigrants to retain their distinct traditions and languages. The burkini — a swimsuit that covers the body from the top of the head to the feet, though not the face — is one aspect of that multiculturalism. It was invented by a Muslim woman in Sydney to enable observant Muslim girls to join their school friends and other children in the beach activities that are an important part of Australian summers.

Australians find it hard to fathom why some French seaside towns should seek to ban the burkini. Without swimming costumes that comply with their religious beliefs, observant families would not permit their girls to go to the beach. That would reinforce, rather than reduce, ethnic and religious divides.