The royal family has lots of rules and protocol about how to dress up for formal occasions. But when it comes to dressing up in costume, there's more room to have a little fun.
While some royal costumes have caused enormous scandals (such as Prince Harry's infamous Nazi costume), others, such as "Cinderella" dresses or masks of each other's faces, are more innocuous.
Here are 10 times royals dressed up in costume.
Queen Elizabeth has been dressing up since she was a young girl.
Queen Elizabeth, then Lady Elizabeth Bowes-Lyon (left) wore what Getty Images describes as a "fancy-dress costume" circa 1909, with her brother, Lord David Bowes-Lyon, at Glamis Castle in Angus, Scotland. Why she and her brother dressed up on this particular occasion is unknown.
She and her sister Princess Margaret put on the pantomime "Cinderella."
In Queen Elizabeth's youth, she and her sister put on Christmas productions at Windsor Castle. In 1942, Queen Elizabeth played Prince Florizel and Princess Margaret played Cinderella and produced the play for the benefit of the Royal Household Concert Wool Fund.
They also starred in a royal production of the Christmas pantomime "Aladdin."
The next year, Queen Elizabeth played Aladdin and Princess Margaret played Princess Roxana in "Aladdin."
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