For more active tween and teen girls, we recommend Athleta's activewear collection for girls. Between practices, playing with friends, or even hanging around the house, you can never have enough comfortable clothing you can wear every day. Plus, they have a lot of different styles and patterns just as sophisticated as their women's line.
We love the Athleta Girl On-the-Go Romper, $58. Rompers are great because they are easy to just throw on and are so versatile they barely look like workout clothes!