The closets of Homer Simpson, Mark Zuckerberg and George Clooney all have something in common.
They don't have much of a range.
Looking at a random sampling of pictures of Clooney over the past few decades will show you that he has been wearing the same colors -- black on black or gray -- for a very long time.
He wears it so constantly that even his Madame Tussauds wax statue wears it, too. When you find something that works, don't mess with it.
Here are all the places Clooney wears the dark on dark combo: