Avoiding politics and serious stuff...
Business suits. I think we will have suits for weddings, proms and formal occasions. But I don't think we will have them for everyday office wear.
People are starting to dress less formally at the office. Business suits are becoming less common. I think in the future people will think wearing suits to the office was a bit silly.
We are moving toward being judged in the workplace by how professional you act, not how professional you look. I see future generations thinking it would be silly that you had to dress a certain way to advance your career.