I have a memory of having read or heard somewhere long ago a story like, The Japanese used to write characters from right to left, which GHQ after the war corrected to left to right…
Alternatively, when the author was a child, in children’s clothes, the buttons and buttonholes on boys’ clothes and girls’ clothes were on opposite sides, and with Japanese dress as well, the direction of a kesa-gake (the diagonal drape of a Buddhist robe) differed for men and women, or perhaps in jinbei and kimono the left and right were reversed in that world, and although I forget which was which, I have a memory that when I tried to put on a woman’s jacket by mistake the buttons were reversed left and right, and as for Japanese dress, I have a memory of being carefully taught, but then, what about the uniforms of Self-Defense Force personnel and police officers? What about Buddhist vestments and white coats? What about kendo-gi and other martial arts uniforms? Or, in gender-free, universal-design Western countries? And so, in the world line as it is now, various reasonable doubts arise. The author has worked at about three security companies, and in two of them, regarding the shoulder-slung cord with a whistle on the uniform, the mouru (a lanyard; aiguillette), although I forget which was which, I feel like I was taught that for police officers and security guards the direction of the braiding, a herringbone vs a V-shape, was reversed. Also, in an anime work called Non Non Biyori, regarding Renge saluting the resident officer (police officer) with her left hand, I have a hazy memory of having read some sort of consideration on the internet at the time (something about a salute for the dead or whatever). As for the rebuttal I received to this, jinbei were, probably for a time, adjusted to buttons so that for little girls there was left-over-right, but basically for yukata and jinbei the default is right-over-left, because if you wear it left-over-right, a samurai’s sword worn on the left would catch when being drawn, and thus left-over-right is considered a burial shroud style; and as for buttons, for boys, since they button their own clothes, the buttons are…
This case is part of the Mandela Effect case database based on "The Window of Opportunity: A Guidepost to the Mandela Effect — The Ultra-Secret X-Files" by Aoyama Takuto.