I remember back when that show first aired. Our family watched it whenever it came on. I also remember my dad, the fatherly critic of all things showbiz, saying: “The show is shot in a warm climate, and that guy is going around all the time with a suit on and a trench coat over that”.
He had to look rumpled.
Back in the 1970s, the cliche was that it rarely rained in southern California. So why did he even need a raincoat?