Purple
From Tardis Wiki, the free Doctor Who reference
Eggplant was a dark shade of purple, named after the fruit eggplant.
The War Doctor wore an eggplant purple scarf. (COMIC: The Lost Dimension)
The Eighth Doctor wore an ascot tie of eggplant dupioni. (COMIC: A Matter of Life and Death)
The Eleventh Doctor wore a frockcoat of eggplant cashmere when travelling with Clara Oswald up to his death. (TV: The Bells of Saint John, etc.)
The Ninth Doctor wore an eggplant sweater. (TV: The Empty Child, The Doctor Dances)
Martha wore a dress of eggplant taffeta. (TV: The Lazarus Experiment)
Donna wore an eggplant sweater when she corrected the paradox. (TV: Turn Left)
