“I want it to be as if there is a free gift with your purchase when you buy my clothes—something you discover within the garment that surprises and delights,” says Susan Woo, the fresh-faced, pint-sized designer who is as vibrant as her collections. This mantra is very much apparent in her Fall 2012 line, where athletic luxe meets urban sophistication and intriguing details like neon seams, utilitarian pockets, and leather quilting.