Cardigan

The Fifteenth Doctor's striped zip-up cardigan. (PROSE: "Heroes of Time" ^[+]Part of Whotopia: The Ultimate Guide to the Whoniverse, Loading...{"namedpart":"Heroes of Time","1":"Whotopia: The Ultimate Guide to the Whoniverse (reference book)"})

A cardigan was a item of clothing found on Earth.

Worn by the Doctor

The Fifteenth Doctor wore striped cardigans. The first one he wore was in rust orange, tangerine, sapphire blue, and mauve purple. (PROSE: "Heroes of Time" ^[+]Part of Whotopia: The Ultimate Guide to the Whoniverse, Loading...{"namedpart":"Heroes of Time","1":"Whotopia: The Ultimate Guide to the Whoniverse (reference book)"}; TV: The Church on Ruby Road) He switched for a mint green cardigan with a beige trim and stripes done in mustard yellow, scarlet, and raven black. (TV: The Church on Ruby Road)

The Fourth Doctor wore a dark brown cardigan with diamonds when he met the K1 Robot, (TV: Robot) when he faced Wirrn, (TV: The Ark in Space) when he fought Field Major Styre of the Sontaran G3 Military Assessment Survey and tricked his marshal into cancelling an invasion of Earth, (TV: The Sontaran Experiment) when he first met Davros who forged the first Daleks during the Genesis Incident, (TV: Genesis of the Daleks) and when he faced Nomad Cybermen during their gambit to destroy Voga after the Great Cyber War. (TV: Revenge of the Cybermen)

The Twelfth Doctor wore a navy blue cardigan with a matching covert coat; (TV: Deep Breath. etc.) most notably during the Good Dalek Incident, (TV: Into the Dalek) and when he met Robin Hood. (TV: Robot of Sherwood)

The Warrior, a parallel version of the Fifth Doctor who looked as the Sixth, spent his first hours in his predecessor's cardigan before switching for double-breasted waistcoats of moleskin with double fob chains of bronze similar to the N-Space Doctor's war incarnation. (AUDIO: Dust Devil)

Worn by Companions

Barbara Wright's cardigan was unravelled by Ian Chesterton while they were in the Space Museum so they could ensure they weren't repeating their paths. (TV: "The Dimensions of Time") Barbara later wore another cardigan while on Aridius. It was later used by Ian to set a trap for the Dalek guarding the TARDIS. (TV: "The Death of Time")

Rani Chandra wore a fuchsia cardigan with a pink blouse. (TV: The Mark of the Beserker)

Martha Jones wore a black cardigan over her vermillion tank top, which she immediately removed upon arriving on the SS Pentallian due to the stifling heat on board the ship. (TV: 42) She was wearing a wine cardigan when she and the Tenth Doctor met Sally Sparrow. (TV: Blink)

Ace wore a black cardigan with her emerald t-shirt when she and the Seventh Doctor helped UNIT to fight Morgaine and the Destroyer. (TV: Battlefield)

Clara Oswald wore a black cardigan with her white blouse and tartan skirt. (TV: The Time of the Doctor, Deep Breath)

Angie and Artie Maitland wore cardigans; Angie's in many colours, and Artie's in midnight blue. Both did this during the Battle of Hedgewick's World of Wonders. (TV: Nightmare in Silver)

Evelyn Smythe often wore cardigans, namely an orange one (AUDIO: The Marian Conspiracy)

Donna Noble wore a mauve cardigan when she and the Tenth Doctor met River Song and some Vashta Nerada. (TV: Silence in the Library/Forest of the Dead)

Liz Shaw wore a raven black cardigan when she risked her own life to save the Third Doctor from the First Rani. (TV: Dimensions in Time)

Worn by Others

Allison Williams wore a beige cardigan when she helped the Seventh Doctor during the Hand of Omega Incident. (TV: Remembrance of the Daleks)

St John Colchester often wore cardigans, which he referred to as "cardies". (AUDIO: Escape Room, etc.)