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In "Silver Nemesis", the Seventh Doctor wore one because Ace put it on his head, having found it in a storeroom in Windsor Castle. In "The Big Bang" & subsequent stories, the Eleventh Doctor wore one because he thought (or claimed to think) that "Fezes are cool." In "The Day of the Doctor", the Tenth Doctor briefly wore one because it fell out of a time fissure (having been thrown into the fissure by the Eleventh Doctor).