Kate Middleton loves this shirt so much that she has it in at least three versions

Nicky J Sims/Pascal Le Segretain/pool/Getty Images

Duchess Kate Middleton is a bit of a fashion icon, but even a royal needs a go-to outfit.

Sleuths at "The Daily Mail" noticed that the Duchess of Cambridge has three versions of essentially the same navy-and-white-striped shirt, and wears them frequently. It's a casual, sporty outfit that nonetheless looks very put together - not bad for the royal version of a hoodie and jeans.