When LeBron James bought the entire Cavaliers squad matching grey suits to wear before Game 3, everyone applauded the movie, as not only did everyone look sharp, it was a cool teammate bonding moment. However, the move didn't really make its intended effect, as the Cavs lost to go behind in the series.
So you can understand why people were a little confused to see the Cavs pulling the exact same move before game 4. Oh and they were also confused as to why the team looked like they had just made their way from the (alleged) MIB headquarters in Manhattan.
The Cavaliers are probably thinking that they could use any advantage they can get, as losing Game 4 and having to win three straight games is a tall order, even for the King.