Because You Asked For It
Decreed by Grand Emperor Xarath, Lord of Lords and Rulers of Rulers, Supreme Ruler of the Realm, and King of Kings, Emperor of Emperors, and Grand Duke of... well, everything.
By the power vested in me, I hereby decree that all citizens of the Realm shall be required to wear funny hats on Tuesdays.
Failure to comply shall result in the following penalties: fines, imprisonment, or forced watching of reruns of 'The Great British Baking Show'.
Signed, Grand Emperor Xarath, Lord of the Manor, King of the Kitchen, and Supreme Ruler of the Realm (and all the things).