Tailcoat

The tailcoat wasa knee-length coat characterised by a rear section of the skirt, known as the tails, with the front of the skirt cut away; a predecessor of the frock coat.

Worn by the Doctor

Sometimes, the Eleventh Doctor wore a black tailcoat. (TV: The Big Bang, Let's Kill Hitler)

Worn by Companions

Josie Day wore a double breast tail coat done on steel blue without sleeves. (COMIC: A Matter of Life and Death, The Lost Dimension)

Worn by Others

Charles Cranleigh wore a crimson tailcoat as part of his Georgian costume in a party round Cranleigh Hall on 1925. (TV: Black Orchid)

Sutcliffe wore a royal blue tailcoat. (TV: Thin Ice)

The Pied Piper wore a scarlet tailcoat when posing as Mr. Spellman, director of Spellman's Magical Museum of the Circus. (TV: The Day of the Clown)

The Ringmaster of the Psychic Circus wore a midnight blue tailcoat with rainbow lapels. (TV: The Greatest Show in the Galaxy)  

The Toymaker wore a black tailcoat when doing a mock dance with the Fourteenth Doctor in London during 2023. (TV: The Giggle)

Popplewick, the human disguise of the Valeyard, wore a double-breasted tailcoat in ebony. (TV: The Ultimate Foe)