>>18491979
The other "fashion leaders" are rich people, celebrities, actors, etc. And these people have all abandoned the suit, either as a power play to say "look at me, I'm so rich I don't need to follow social rules" or they simply never knew them to begin with, many newer rich people were just regular dudes who go rich without having to earn it in the old fashioned way, of being in with the aristocracy.

With nobody left to promote the suit as an icon of fashion, it's no wonder it died out so quickly