William and Kate arrived in Ottawa, Canada on Thursday for their first official foreign visit as a married couple.

Just like Michelle Obama, what Kate will wear attracts a lot of attention. She even has her own website that chronicles all her clothes called What Kate Wore. If you know Duchess had changed her clothes on Thursday, you can understand how the website is indispensable.

Even when Kate was William's girlfriend at St. Andrews University, what she wore already became the hot topic. Now Kate's fashion influence the whole world. In another word, Kate Middleton's evolution creates fashion revolution.