According to latest news someone (possibly the central French government, although that's not terribly clear) won a legal challenge against the city of Grenoble, which had recently lifted their burkini ban in public swimming pools.
France’s highest administrative court on Tuesday upheld a ban on so-called burkinis in Grenoble’s public swimming pools.
Interestingly enough however, according to an older VOA article, Rennes had made the same decision some years back but that apparently wasn't challenged in courts.
A few years ago, local authorities quietly changed pool rules allowing all kinds of swimsuits, including burkinis. Initial controversy soon quieted down. Now, of the thousands swimming in Rennes public pools each year, local government says, just over a handful wear burkinis.
So, does the decision of the "highest administrative court" also automatically force Rennes to go back on their decision regarding burkinis?