For years, Kate Middleton’s fashion choices have been a masterclass in polished, princess-perfect style. But her look on March 15 at the Six Nations match in Cardiff? A quiet departure from the norm—one that signals a shift in how she’s approaching fashion altogether.

There are a few fashion rules that pretty much everybody can recite verbatim. No white after Labor Day. Always match your belt with your bag. And, of course, never, ever mix navy and black. Although these rules may sometimes make sense,

Princess Kate attended the Six Nations Rugby game between England and Wales. The Princess of Wales reportedly missed a Middleton family milestone to attend the sporting event. Of course, as the patron of England's Rugby Football Union and the Rugby Football League,