1. I would like to know if I need to pay khums on the expenses of hajj, umrah and Ahlulbayt zeyarat?

2. Can someone wear clothes and hijab during hajj, umrah and ahlulbayt zeyarat that person is not sure whether khums was due on this these clothes and hijab or not?

1- If the money has not completed a year at your custody, or your khoms day has not arrived, then no.
2- Yes.