Waistcoat

A waistcoat was an article of clothing.

While acting as his successor, Jack Harkness wore the Sixth Doctor's coat, including his seventh favourite waistcoat and yellow-stripped trousers. (AUDIO: Piece of Mind)

During his retirement to the Victorian era, the Eleventh Doctor wore a battered felt top hat, a burgundy frock coat, a waistcoat with collars and a pocket watch with a fob chain. (TV: The Great Detective, The Snowmen)