Wool
From Tardis Wiki, the free Doctor Who reference
The Sixth Doctor's coat featured patches of peach wool. (TV: The Twin Dilemma-Time and the Rani) His successor, the Seventh Doctor, had this before switching for a silver grey safari jacket. (TV: Time and the Rani-The Greatest Show in the Galaxy)
Wool was used to make greatcoats including the one worn by Captain Jack Harkness. (TV: The Empty Child, onwards)
