When it comes to putting on clothes, EVERY DAY IS BACKWARDS DAY. There seems to be a preference for it. Shoes, pull-ups, pants, dresses, shirts, all go on backwards. We advise they are, which in the morning tends to result in correction. Just before bed, it tends to result in the declaration of Backwards Day.
Of course, being tired, we just allow it.
I started it by making the reference to a Daniel Tiger story where Ms Elena declared it Backwards Day. Daniel loved the game, but O the Owl resisted. I felt like O, but I just now roll with it. I used it as a critique of myself, but now Fleur loves the game.