By Order of the Supreme Ruler of the Realm, it is decreed that all citizens shall wear the most comfortable, most relaxed attire possible on this, the 51st day of Casualness.
Failure to comply shall result in severe penalties, including but not limited to: forced watching of reruns of "The Great British Baking Show", mandatory listening to elevator music, and/or being forced to participate in a 4-hour meeting to discuss the importance of "self-care".
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By the power vested in me, I, the Supreme Ruler, command you to be CASUAL.