According to this report in The Hindu, banning burkhas in colleges is unconstitutional. The DCP of Dakshin Kannada says, the ban on burkha by a certain college in Mangalore is a “impingement on the individual and fundamental rights guaranteed by the Constitution”
So while banning burkhas is unconstitutional, banning the wearing of jeans and skirts and the like is not. Colleges in Uttar Pradesh have done so.
So unless people make “wearing jeans” part of some religious practice, colleges are free to ban it. With no one to stop them.