Long or short, patterned or plain, our edit of designer girls' trousers, jeans and shorts will guarantee she showcases the very best in style. Whether for daytime adventures or so as to channel evening chic, look to everything from velour sweatpants and printed leggings to mini-me jeans and black trousers from the likes of Juicy Couture, Ralph Lauren Kids and Dolce & Gabbana Kids.