Maroon was a colour.

Martha Jones wore a maroon leather jacket. (TV: Smith and Jones, The Shakespeare Code, Gridlock, Daleks in Manhattan/Evolution of the Daleks, The Lazarus Experiment, The Sound of Drums/Last of the Time Lords)

The Hazrateen had maroon skin. (AUDIO: The Taste of Death)

The Seventh Doctor wore a maroon scarf up to his death. (TV: Doctor Who)

The Ninth Doctor wore a cravat of maroon brocade during the launching of Titanic. (TV: Rose)

The Third Doctor wore a smoking jacket of maroon velvet. (TV: Terror of the Autons)

The Twelfth Doctor wore a maroon Crombie coat. (COMIC: The Highgate Horror)

The Master wore a maroon moleskin coat. (AUDIO: Master of Worlds)