Your drinking buddies might think it is cool that you still have the t-shirt from that Pearl Jam concert in 1991, but your boss doesn't. Save it for the bar. Or for painting your house.
If you're the type of maverick who's ever gone to a formal event in a tuxedo t-shirt or a gown and Chuck Taylors, then you'll probably benefit from this list. It could potentially make a difference in your future earning potential. Seriously.