Speaking of men’s fashion, Harry had a checked jacket and colorful striped tie to match his new sideburns.
That was definitely an inspiration from Rosemary’s Baby. [Laughs.] There is a scene where Rosemary is talking to her older neighbor [Roman Castevet, played by Sidney Blackmer], and he is wearing this checked jacket. I saw that and thought, “Oh my God, I want to do that for Harry!” I watched Rosemary’s Baby so many times, that was another big inspiration for me.
—Vanity Fair Interviews Mad Men Costume Designer Janie Bryant