I don't know who or why but somebody, somewhere got fed up with Monkey D. Luffy's antics and decided he needed a humiliating put down. So he was brought up. WAY up by his underwear for whoever comes passing by to see. It might have been a thing that lasted an entire day from the looks of it too.
In whatever Rp I do, should Luffy be in it, I traditionally always give him the My Little Pony: Friendship is Magic briefs. Him and Charmy Bee. I have no real reason why. I've just decided that the two of them are huge secret bronies for some reason. Shrug.
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