The Undertaker's entire persona would be a lot less creepy and intimidating if it weren't for his Badass Longcoat and trademark wide-brimmed hat together making him look like a gigantic psychotic Amish gravedigger.
Also the bandanas that he wore as Biker Taker. He even color-coded them to an extent— when he was wearing red, he was in full-blown heel mode, while black/dark blue generally were for his face persona, although the rule wasn't absolute.
ECW Superfan "Hat Guy" is actually an inversion; his straw hat and loud tourist shirts made him look like he's (as Joel Gertner put it) "still hung over from the Reagan administration."
WCW's Buff Bagwell wears that giant top hat during his entrance theme.
Sheamus' Celtic crown that he began wearing ever since he became King of the Ring.
Billy and Bart Gunn/The Smokin' Gunns with their cowboy hats. The Berserk Button aspect was invoked when the Heavenly Bodies invaded and then made fun of and finally stomped on those hats, prompting a No-Holds-Barred Beatdown.
Mr Fuji was famous for the bowler hat he wore as a manager until 1993 and which gave him a look that drew comparisons to the character Oddjob from the James Bond movie Goldfinger, played by wrestler/actor Harold Sakata, and, like Oddjob, Fuji also qualifies for Badass in a Nice Suit.