Tartan

Tartan was a type of pattern, famously linked to Scotland

The Sixth Doctor's coat featured patches of red tartan. (TV: The Twin Dilemma)

The Fourth Doctor wore a Clan Wallace tartan scarf during his encounter with the Zygons. (TV: Terror of the Zygons)

For a while, the Seventh Doctor wore a crimson and black tartan scarf. (TV: Time and the Rani)

The Third Doctor wore inverness capes of tartan done on scarlet and green (TV: The Curse of Peladon) or brown. (TV: The Five Doctors)

Clara Oswald wore a Clan Campbell tartan dress when she self sacrifices to save the Eleventh Doctor from the Great Intelligence's master plan. (TV: The Name of the Doctor) She also wore a Clan Wallace tartan skirt with her black cardigan and her white blouse. (TV: The Time of the Doctor, Deep Breath)

Yasmin Khan wore a cravat of tartan. (TV: Survivors of the Flux|The Vanquishers)

Jeremiah O'Kane owned a tartan blanket. (HOMEVID: The Zero Imperative)