I suppose that during the time he is responsible for her, he can buy her whatever he wants and dress her in it (within reason). But it is not up to him to dictate to you what she wears when you are responsible for her (within reason).
Complimentary, because many parents (including presumably the OP) want their children to not be pushed into a particular gender stereotype so that they are able to express themselves more fully and freely both as children and when they become adults.
ME: 'can girls wear black trainers' DS: girls aren't doing it ME: No, can girls wear black trainers DS: Where? ME: On their feet. Can girls wear black trainers? DS: No, girls can't wear trainers as they have a higher instep than boys. even more.
Asked my 2 DDs just now "DD2, can girls wear balck trainers?" Puzzled look, "not sure" "DD1, can girls wear black trainers?" "Maybe. It doesn't really matter what colour of trainers you wear. Anyone can wear what they like" DD2 nods sagely.