First of all, a 16 year old does not want their mom at their birthday party. If you are one of the lucky moms that don't embarrass your kid at that age, then whatever you wear will be fine.
Wear whatever your friends wear.
People normally wear college basketball jerseys when attending college basketball games to show support for their team. One might also wear them in many social situations such as playing basketball or hanging out with friends.
clothes
They wear their birthday suit
I assume you are talking about the Swiss Guard. They are the men who look after the pope's security in the Vatican and wear a costume designed by Michelangelo in the 16th century. It is not a clown costume.
flats, skinny jeans or jean shorts, cute tank top or dressy shirt.........
dirty shirt trousers and hat
wear clothes that fits your personality. wear clothes with colours that fits your skin colour.
Yo can wear a shirt that is purple
Marie Antoinette is a ruler of Britian from the 16th century. Thus her costume will be designed on a noblemens wear from the 16th century.
well i well wear a dress