He’s more corrupt than evil, but Dan McGinty in The Great McGinty buys a suit from the money he makes by helping the boss that’s described as a “horse blanket” – garish and ugly.
Perhaps then a good example is the crass billionaire developer Daniel Clamp from Gremlins 2. Totally fictional.
It’s been a long time since I’ve seen it, but wasn’t Fredo in The Godfather pretty tacky and very un-Corleone-like by the end? I recall Michael showing up in Vegas in his dark suit and Homburg hat, and Fredo meeting him in a white jacket and pastel shirt open to show his necklaces. I’m almost sure that was when Michael decided to knock him off.