Sky blue
Sky blue was a light shade of blue named after the sky.
The Eleventh Doctor wore a sky blue shirt throughout the latter half of his life, (TV: The Bells of Saint John, The Day of the Doctor, et alt.) leading up to his death and regeneration into the Twelfth Doctor (who consequently spent his first hours in that same shirt). (TV: The Time of the Doctor) The Tenth Doctor had previously worn a sky blue shirt. (TV: The Idiot's Lantern)
Diane Holmes also wore a sky blue shirt, with her sleeves rolled up, when adapting to the 21st century. (TV: Out of Time)
Sarah Jane Smith sometimes wore a sky blue shirt. (TV: The Day of the Clown, Enemy of the Bane)
Harry Sullivan wore a sky blue shirt during his travels with the Fourth Doctor. (TV: Robot, The Ark in Space, The Sontaran Experiment, Genesis of the Daleks, Revenge of the Cybermen)
The General wore a sky blue uniform, complemented by golden epaulettes, during the original Gallifreyan Civil War. (PROSE: Warmonger)
