Nirwan, People call dhoti to the people who wear dhoti in their everyday life. Not to the people who wear dhoti in their religious ceremony. Dhotis that people put on in religious ceremonies are different from that dhoti people wear in India and Nepal just to get rid of the hot weather and the one that women put on. And people call dhoti to the people who are Indians not just coz they are of Indian origin because of the hatred against Indian policies towards Nepal. So calling dhoti is not for ethnicity, it is the matter of nationality.