The city of Nice, still shaken by last month's deadly extremist attack, has joined a growing number of French resort towns to ban the body-covering burkini swimsuit.
Political leaders argue that the swimwear, resembling a full-body wetsuit with a hood, oppresses women and violates France's secular principles. But many see the bans as discriminatory.
Nice was devastated when a man drove a truck into crowds watching fireworks on July 14, killing 86 people in violence claimed by the Islamic State group.
The death of the 86th victim, a man hospitalised with injuries, was announced on Friday, more than a month after the attack.
About a third of the victims were from Nice's large Muslim community, which is both in mourning and fearing a backlash.
The Nice administration issued an order on Thursday banning swimwear with religious connotations, citing security concerns.
Several other cities on France's Mediterranean and Atlantic coasts have banned burkinis this summer.