My son wears skirts

A couple months ago I read my son the book "My Name Is Jazz". Its a childrens book about a transexual girl. My four year old was so excited by it. He kept asking if we could meet her and if there were more people like her. Then a couple weeks passed and we went clothes shopping. He asked if he could dress like Jazz. Absolutely! He now spends most days in leggings, a tutu, and a monster truck shirt.