Her Royal Majesty after watching Alice in Wonderland decided that she wanted to be the Mad Hatter! Apparently the Cheshire Cat or whatever it's called did not appeal to her at all. She mumbled something about a very creepy smile! Instead she thought the Mad Hatter fit her personality a lot better. So her lowly servant went off to find a costume to fit her demands. So after a brief photo shoot this was the result!
(It's actually a snowman's costume from Grandma for Christmas. Ssh don't tell her majesty.)