Rust (colour)
From Tardis Wiki, the free Doctor Who reference
Rust was a dark shade of orange, red and brown called after iron oxide.
The Doctor wore rust blazers during his third (TV: The Curse of Peladon) and fourth incarnation. (TV: Robot, The Ark in Space, The Sontaran Experiment, Genesis of the Daleks, Revenge of the Cybermen) He also wore a rust jumper with a v-neck collar during his ninth incarnation. (PROSE: The Guide to the Dark Times) The thirteenth incarnation also wore a rust t-shirt. (TV: Eve of the Daleks)
Missy wore a rust cravat. (TV: Extremis-The Doctor Falls)