Ivory (colour)
From Tardis Wiki, the free Doctor Who reference
Ivory was a shade of white, named after the substance which make up the tusks of some animals.
The War Doctor wore herringbone scarf done in burgundy and ivory up to his death. (TV: The Night of the Doctor, The Day of the Doctor)
Sarah Jane Smith wore an ivory lace dress when she and the Fourth Doctor met Sutekh. (TV: Pyramids of Mars)
Emily Morris wore an ivory cravat with black marks when she met Sarah Jane Smith. (TV: Lost in Time)
Missy wore an ivory blouse with her walking suit. (TV: Deep Breath, etc.)
The Seventh Doctor wore an ivory safari jacket. (TV: Time and the Rani, Remembrance of the Daleks, Silver Nemesis, etc.)
Bill Potts wore an ivory cravat when visiting the 1814 frost fair. (TV: Thin Ice)
