DD wears a skirt to school (nursery) but keeps falling over in the playground. As a result her knees are a total mess, and are covered in scrapes. She gets so overexcited when she sees her friends that she runs around like a loony and inevitably trips and cuts her poor knees to shreds on the concrete floor. Should I buy her some school trousers, even though I have already shelled out for skirts, or hope that she starts to be a bit more careful? And if I did buy trousers, would these get wrecked too?