Multi-culturalism and political correctness are problematic.  If the rule for taxi drivers include certain clothing, and you cannon abide by those rules, then you should not be a taxi driver.  Yielding to Islamic traditions is a slippery slope that has led may European countries into serious problems.  We do not have Jewish courts, and I am unaware of any lawsuits brought by the ultra orthodox Jewish community regarding dress for employment.  I am unaware of any American Indians suing because they cannot wear traditional dress while working.  Why are we making exceptions for Muslims?  Next we will be allowing Sharia courts (as many European countries do) because ‘it is the right thing to do’.  Sorry, this is America, you should speak English and comply with our general standards.  We should not be ‘changing’ the US to accommodate every other culture.  If they want that culture, go somewhere it is the accepted practice.  My Grandfather did not sue the schools in New Jersey because they did not have classes in German, or expect it….