Purple

Eggplant was a dark shade of purple and brown, named after a certain fruit.

The War Doctor wore an eggplant purple scarf he helped his previous and future incarnations to prevent the universe from being destroyed by the Void. (COMIC: The Lost Dimension)

The Eighth Doctor wore an ascot tie of eggplant dupioni under the collar of his white shirt during his travels with Josie Day. (COMIC: A Matter of Life and Death)

The Eleventh Doctor wore a single breast frockcoat of eggplant cashmere; (TV: The Bells of Saint John, etc) most notably when helping to foil the 1562/2013 Zygon Invasion of Earth and revisting the Fall of Gallifrey on the final day of the Last Great Time War, (TV: The Day of the Doctor) and before and after the Siege of Trenzalore. (TV: The Time of the Doctor) His successor, the Twelfth Doctor, wore it during his first hours. (TV: The Time of the Doctor, Deep Breath)

The Ninth Doctor wore an eggplant jumper when he met Captain Jack Harkness, Jamie, Nancy, and Doctor Constantine. (TV: The Empty Child, The Doctor Dances)

The Sixth Doctor wore an eggplant cravat when he helped to foil Antonia Bailey and Robert Slater on Manchester during 2008. (AUDIO: The Condemned)

Clara Oswald wore an eggplant plaid dress over her mustard sweater during an encounter with ghosts in the Drum during 2119. (TV: Under the Lake/Before the Flood)

Susan Foreman wore an eggplant shirt under an alabaster sweater vest when meeting River Song, (AUDIO: An Unearthly Woman) when meeting the Inventor Master on Destination, (AUDIO: The Destination Wars) when spending time on New York City during 1888. (AUDIO: The Great White Hurricane) when confronting Takagi Mamoru and Casper Knox in Japan during the 1820s, (AUDIO: The Barbarians and the Samurai) and when facing Xesto in Tick-Tock World. (AUDIO: Tick-Tock World)

Jo Grant wore an eggplant purple jumper when she first meets Sea Devils during the Seaspite Incident. (TV: The Sea Devils)

Donna wore an eggplant turtleneck jumper when she corrected the paradox in the parallel world created by the Time Beetle. (TV: Turn Left)

Emma-Louise Cowell wore an eggplant shirt while adapting to the 21st century. (TV: Out of Time)

The President of Great Britain wore an eggplant tie. (TV: Rise of the Cybermen)

Albert Smithe wore an eggplant hoodie when dreaming he was a scientist on the North Pole during Christmas Eve because of dream crabs. (TV: Last Christmas)

Zoe Heriot wore an eggplant jumper when reuniting with Jamie McCrimmon on the Memory TARDIS. (TV: The Mind Robber)