If you've ever headed to the mall to window shop, you know that clothes can be expensive. Sometimes, however, they can be really expensive. What's responsible for the outsized price tags for the world's most expensive clothing? Extraordinary design, exceptional materials, hand-crafted detail and uniqueness are only a few factors that determine haute couture. And occasionally, value is all in the eye of the beholder. Take this quiz and see how much you know about the world's most expensive clothing.