Midnight blue

Midnight blue was a dark shade of blue named for its resemblance to the apparently blue colour of a moonlit night sky.

The Eighth Doctor wore an ascot tie of midnight blue dupioni during the Last Great Time War right up to his death. (TV: The Night of the Doctor)

The Third Doctor wore a midnight blue cravat. (TV: The Ambassadors of Death)

Bill Potts wore midnight blue overalls under her navy peacoat. (TV: The Lie of the Land)