Last Thursday, Queen Elizabeth visited Royal Regiment of Scotland at Dreghorn Barracks in Edinburgh. She wore a new royal blue hat with a round, flat crown and a very flat brim.

Several readers commented and emailed that the very simple shape of this hat looked familiar. Take a look at this:
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Visiting Fortnum & Mason on Feb 29, 2012 and Australia on October 23, 2011
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At the Armed Forces Diamond Jubilee Parade and Muster, May 19, 2012
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July 4, 2010 in Canada and October 9, 2009 attending a commemoration service
UPDATE: Since this post was published, Queen Elizabeth has added these additional hats in this same shape:
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Maundy Thursday Service, April 17, 2014 and in Northern Ireland, June 25, 2014
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At Royal Ascot, June 21, 2014 and visiting Scotland, July 4, 2014
These hats, all confirmed to be designs of Angela Kelly, clearly used the same hat form for their construction. I find the very flat lines of this hat form a little too harsh the Queen, and think it needs much trim to soften it up. I do, however, find it rather fascinating to see how this group of hats, in exactly the same shape and all covered in fabric (except the last one in textured straw), can still develop individual character. It makes me wonder, dear readers, which one of these flat brimmed hats is your favourite?
Photos from Getty as indicated; Associated Press
A number of readers have sent inquiries about the the bearskin hat Prince William (and Prince Charles and the Duke of Kent) wore