Sorry, Dakota, but your 13-year-old sister has surpassed you in the fashion world. And Elle has the floral, hippie-chic market cornered in the teen market. "I love vintage -- '60s and '70s are my favorite. I love baby-doll dresses and the soft colors," she tells Seventeen. "I love Alexa Chung. I like how she dresses young for her age. I'd much rather dress like a 5-year-old than a 21-year-old. I'd much rather wear a puffy-sleeved shirt than some low-cut top."