Good catch! Shame on me, I looked right over this. Clearly Brideshead was a transformative experience. Add to this, Edward Fox:

Fox has a reputation of his dapper and well-spoken, almost Edwardian, on-screen persona translating into real-life.

He admits he still wears the suits he donned for Edward and Mrs Simpson, even though he knows it makes him seem fusty.

But he is proud of the fact that he has never worn jeans, adding: "I won't wear shell suits either."

Mr. Soames will no doubt approve.