@Finn dAbuzz,
No, it a recent decree (
arrêté municipal ) by the mayor of Cannes.
That was confirmed yesterday (Saturday) by the administrative court in Nice. (The case will now go to the appellate court, the
Conseil d'État ["Council of State"], I suppose.)
The banning of the burkini is between July 28 and August 30.
The Nice court said, it was following the French constitution (article 1: "La France est une République laïque")*
*The text of the decree says that i between the above mentioned dates the access to the beach and swimming areas is "forbidden to anyone not having a dress, respectful of morality and secularism, .... ..."
(...
d'accès aux plages et de baignade à toute personne n'ayant pas une tenue correcte, respectueuse des bonnes mœurs et de la laïcité, respectant les règles d'hygiène et de sécurité des baignades adaptées au domaine public maritime, ainsi que le port de vêtements pendant la baignade ayant une connotation contraires à ces principes.)
So it's a
«plages laïques» as they call this now on the Côte d’Azur, Cannes, a secular beach ...