The Doctor's scarf

The Doctor's scarf was a long, multicoloured piece of knitwear that was an important part of the Doctor's outfit during his fourth incarnation.

When the Doctor, shortly after his third regeneration, had to accompany the Brigadier on a journey, he tried on several inaproppriate costumes before settling on a vaguely bohemian outfit, which included a wide brimmed hat and a long scarf (DW: Robot). The scarf had originally been made for the Doctor by Madame Nostradamus (DW: The Ark in Space).

The scarf proved to be useful on many occasions, as something other than a piece of attire. On Nerva station, the Doctor unsuccessfully used it to try to deactivate the Auto guard (DW: The Ark in Space). It came in useful for measuring a puzzle in the pyramid of Mars (DW: Pyramids of Mars), tripping Eldrad down a chasm (DW: The Hand of Fear) and in the Matrix on Gallifrey to prevent the Doctor from falling down a cliff face (DW: The Deadly Assassin).