Michael Irvin says he's dressed in all black to "mourn" the death of Jason Garrett's run with the Dallas Cowboys ... though he admits Jerry Jones made the right decision to fire him.
Mike and Garrett go wayyy back -- like decades -- and Irvin says he still considers the ex-Cowboys coach to be a "very good friend."
But, when it comes to the Cowboys, Irvin -- who we talked to from the set of "Inside The NFL" -- says the team simply needs new leadership .