Britain's Catherine, Duchess of Cambridge, holds her baby son outside the Lindo Wing of St Mary's Hospital before leaving with Prince William, in central London July 23, 2013. Register now for FREE unlimited access to Reuters.com Register"I think, to a certain extent, her clothes were a uniform for her." That could see a shift in the royals' association with fashion from formal structures to more relatable - if restrained - styles. It was seen as an homage to Diana, also photographed in polka dots when returning home with baby Prince William. The Queen set a high bar when it came to striking the right tone, said Elizabeth Holmes, author of 'HRH: So Many Thoughts on Royal Style'.

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