Ascot tie
From Tardis Wiki, the free Doctor Who reference
An ascot tie is a necktie, occasionally worn under the collar of a shirt.
The Eighth Doctor wore ascot ties of dupioni in flaxen yellow (COMIC: The Pictures of Josephine Day), eggplant purple (COMIC: A Matter of Life and Death), or midnight blue (TV: The Night of the Doctor) under his white shirt's collar.
The Curator wore ascot ties done on navy blue (TV: The Day of the Doctor) or burgundy (COMIC: The Then and the Now) under his beige and maroon tatterall shirt's collar
Redvers Fenn-Cooper wears an ascot tie of burgundy and gold paisley under the collar of his ivory shirt. (TV: Ghost Light)