My wife tells this better than I do - she can impersonate HRH Chas & HRH Liz...
HRH Chaz goes to the passing out parade at the Durham Light Infantry. He's dressed in the usual military outfit, but he's wearing a hat that looks like the last person to wear it was Davy Crocket.
The parade goes off well. No one dares mentions the smelly old hat with the long fluffy tail that HRH is wearing.
At the Mess that night, a 2Lt finally drinks enough to ask HRH the question everyone has been dying to ask him all day :
2LT : "I think it went splendid, splendid, your royal highness" (grovel, grovel) "But I have been wondering, your highness, why, the most unorthodox, but rather wonderful" (toad toad) "unusual fur hat"
HRH Chas : "It was all Mummy's Idea. This morning at Breakfast, I said 'Mummy, today I'm off to Middlesborough, to see the passing out parade of the Durham Light Infantry'. Mummy said 'Middlesborough? Where the fox hat!' So I did!"