What's the one clothing item Donna Karan likes to wear the most?

In an interview on NPR's "Fresh Air" on Monday to promote her new memoir, "My Journey," Karan shared a lot of wisdom , from how to design the perfect pair of jeans (it's all about the shape), to how she transitioned from running Anne Klein as a new mother to starting her eponymous label, and then DKNY after, taking it to such global heights.