All municipalities, the city of New Orleans excepted, and in the city of New Orleans the department of police, may place one or more matrons or policewomen in dance halls that are open to the public or that charge for admission or that charge for the privilege of dancing or charge for the services of food where dancing is conducted.  These matrons shall see that no lewd, vulgar, or suggestive dances are held, and that the costumes of persons dancing or performing in those places are proper.