Where's Michelle Obama's hat?

(CBS) - First lady Michelle Obama wore a stylish spring outfit when she and President Obama met Queen Elizabeth II on Tuesday, but there was once piece of accessory some may think was missing from her look: A hat.

Pictures: Obamas get royal welcomePictures: Obamas visit IrelandPictures: Mrs. Obama

Dressed in a contrasting turquoise Barbara Tfank dress and pink bolero, Mrs. Obama stood out while standing alongside the Queen, who wore a matching floral dress suit with a light blue hat and Camilla, the Duchess of Cornwall, who donned a cream dress and jacket with a matching hat by Philip Treacy, during the official welcoming ceremony at Buckingham Palace.

While headpieces are not by any means required when meeting the Queen, wearing one could be interpreted as a sign of respect to the British monarch. Samantha Cameron, wife of the Bristish prime minister, was severely criticized in the UK for not wearing a hat to the royal wedding last month.

France's first lady Carla Bruni-Sarkozy wore an understated,grey pillbox hatwhen she and husband French president Nicolas Sarkoz, arrived for their state visit to Britain back in 2008.

Hat or no hat, Mrs. Obama's choice outfit was consistent with her personal style: cheerful with bold mix-and-match elements.

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