I despise islamic dress code, but part of me is uncomfortable with banning them. Strictly speaking they don't harm anyone.

Emerainville Mayor Alain Kelyor said "all this has nothing to do with Islam", adding that the swimsuit was "not an Islamic swimsuit" and that "that type of suit does not exist in the Koran".
I always think it's odd when people do this. You never hear of protestants lecturing catholics on how to venerate saints, or McDonalds refusing to allow jews inside because they're not allowed to eat there according to their religion...

Somebody should try entering a French pool in a diving suit to see if anyone makes a complaint about it.