DD never wears skirts or dresses outside of school, she wears jeans and leggings and trousers and shorts. At school she's forced to wear a school skirt, and as of half term, a summer dress. We asked could she wear trousers, or the tracksuit joggers she has for PE, or smart shorts, but all were rejected. They are not seen as "smart" or traditional. AIBU to think this is silly and very sexist?