Designer brands in Paris, Milan, and Tokyo are copying hip-hop street life today, and the T-Shirt is the urban fashion staple. Now, the first book from the women who redefined and marketed the torn T-shirt concept and started a fashion craze, shares 20 unexpected and easy-to-follow projects for every gal from 10-25. Here's a way to be hip, cool, and fiscally responsible—all at the same time.