Why I dress the way I do

Recently, in my department at IISc, interviews were held for the next batch of students. I was ordered to volunteer during the interviews. I was also warned not to dress loudly, and to be presentable and behave politely with everyone. So I wore a plain shirt, formal trousers, oiled my hair heavily and combed it neatly. I was also very humble and helpful to all the people. At the end of the interview, one of the candidate's parents thought that I was a peon and tipped me