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it took me an embarrassingly long amount of time to realize the white suit + blue shirt + blue tie Kaiba wears in S5 is because it's a reference to his fav monster: the Blue Eyes White Dragon 
I watched the whole tournament in s5 thinking,
"that's an interesting choice, usually pale/white people don't wear that much white, but he's a living fashion statement so I guess it works"
didn't even bother to check the shirt/tie color until today because normally I don't check details like that