One part of the Fifth Doctor's costume that was not his idea was the retention of the question mark-lapeled shirt from Tom Baker's season 18 look. He was specifically asked to keep them in, via a 10 February 1981 memo from John Nathan-Turner to Lavers. "I do feel that the Doctor Who shirt with the '?' mark on the lapels is worth hanging on to," wrote Nathan-Turner. (REF: The Fifth Doctor Handbook)