Frock coat

A frock coat was an article of clothing.

Worn by the Doctor
The First Doctor wore an Edwardian frock coat. (COMIC: Moon Landing, PROSE: Sanctuary)

The Fourth Doctor wore frock coats; one of burgundy velvet  (TV: Pyramids of Mars, The Masque of Mandragora - The Deadly Assassin) one of grey tweed (TV: The Android Invasion et al) one of chocolate brown velvet, (TV: The Face of Evil et al) and one of light brown Harris tweed. (TV: The Power of Kroll et al)

The Fifth Doctor wore a beige frock coat (TV; Castrovalva-Warriors of the Deep).

The Sixth Doctor initially wore a patchwork frock coat with several different colours and fabrics, (TV: The Twin Dilemma onwards) which he replaced with a similar coat in different shades of blue for a period (AUDIO: Real Time onwards) before returning to the original up to his death. (TV: Time and the Rani)

The Eighth Doctor wore many frock coats of velvet done in forest green, (TV: Doctor Who) navy blue, (COMIC: Dreadnought), olive green. (COMIC: Ophidius), or dark brown. (PROSE: The Year of Intelligent Tigers)

On the Titanic launching of 1912, the Ninth Doctor wore a black moleskin frock coat. (TV: Rose)

During his retirement to the Victorian era, the Eleventh Doctor wore a burgundy frock coat. (TV: The Great Detective, The Snowmen) When travelling with Clara Oswald, he wore a frock coat of eggplant purple cashmere. (TV: The Bells of Saint John - The Time of the Doctor).

The Twelfth Doctor occasionally wore a black frock coat. (TV: The Pilot)

The Fugitive Doctor wore a navy tweed frock coat. (TV: Fugitive of the Judoon, The Timeless Children, Once, Upon Time)

The Curator, taking the form of an older Sixth Doctor, wore a violet moleskin frock coat. (AUDIO: Crossed Lines)

Worn by Companions
Romana wore frock coats on scarlet, (TV: The Horns of Nimon) or beige. (TV: State of Decay)

Won by the Master
Many versions of the Master wore frock coats.

The Saxon Master wore a black, asymmetrical frock coat when he met Missy, his gender-switched incarnation, along with the Twelfth Doctor (TV: World Enough and Time|The Doctor Falls)

The Spy Master wore a plum purple tweed frock coat during his encounters with the Thirteenth Doctor. (TV: Spyfall, Ascension of the Cybermen|The Timeless Children)

Worn by others
Webley wore a double breasted frock coat of bottle green tweed with a scarlet overcheck. (TV: Nightmare in Silver)

Edward Waterfield and Theodore Maxtible wore frock coats; Edward's navy and Theodore's charcoal. (TV: The Evil of the Daleks)