Okay Kaiba, if you’re such an expert on fashion, let’s break down some of your outfits.
A purple trench coat over a green dress shirt and green pants. Stylin color combination.
A sleeveless white trench coat (is that even a thing? do they make sleeveless trench coats?) with red lining, a high collar, studs, and pointy shoulder pads. Worn over a black shirt, black pants made of what looks like–what, leather, rubber?
–with a pair of belts tied around each leg, matching belts around each arm, some kind of funky metal bracelets…
…and heels. Guess that explains why his height varies wildly from shot to shot.
The Best-of-Both-Worlds Trench Coat: even purpler than Trench Coat 1, and with even pointier shoulder pads than Trench Coat 2. Worn over a black turtleneck, with the same bracelet/arm cuff/whatever thingies from outfit #2.
This ensemble shows up a lot in scenes where he’s in his office doing day-to-day Kaiba Corp business.
Maybe he thinks the loafers make it business casual.
In conclusion: nice outifts, dork.