Oops, right idea, wrong section of the Charter of Rights and Freedoms. The niqab and burka are not, by any stretch of the imagination religious requirements of Islam. They are merely misogynistic cultural traditions under the guise of religion. You want to use sections 2 (b) and not 2(a) and perhaps 15(1). Still because the law is not an out right ban it might not be defeated but only modified.