Mr shrestha babu, "Katro" means what you will wear when you will be put over the piles of woods and "katto" means what you are trying to imply!!  Precisely, they call it " katte bahun" to humiliate all the bahuns but not all bahuns accept " katto", only poor bahun would do that. I feel rather sympathetic to those "katte" than humiliate them!!

Again being igonrant  is a disease!!