Tights
Tights were a kind of cloth leg garment, most often sheathing the body from above the waist to the feet with a tight fit, hence the name. Though primarily worn by women, they were also commonly worn by men in eras such as the Middle Ages.
When Starkey, a native of 2050, asked a virtual reality simulation of Robin Hood, "What's with the tights?", he replied that it was the fashion of the time and that it was chilly. K9 confirmed that Britain was on average three degrees colder in the Middle Ages. (TV: The Last Oak Tree)
Ace often wore tights, so much so that she told Sally Morgan that all she needed to take with her from the TARDIS were a "three cans of nitro and a spare pair of tights". (AUDIO: Black and White)
Rose Tyler wore tights on her trip to 2006 Cardiff, (TV: Boom Town) 1879 Scotland, (TV: Tooth and Claw) and 1953 London. (TV: The Idiot's Lantern)
Muriel Frost was wearing a US Army Major's uniform with a skirt and tights when she was killed by the Slitheen. (TV: Aliens of London [+]Loading...["Aliens of London (TV story)"]/World War Three [+]Loading...["World War Three (TV story)"])
Maria Jackson wore tights as part of her school uniform. (TV: Revenge of the Slitheen)
Donna Noble wore tights as part of a skirt suit which she used to pose as a Health and Safety officer while investigating Adipose Industries. (TV: Partners in Crime)
Amy Pond wore tights as part of her kissogram policewoman outfit. (TV: The Eleventh Hour, A Christmas Carol)
Clara Oswald wore tights with her outfits. (TV: Nightmare in Silver, The Name of the Doctor, The Time of the Doctor, Deep Breath, The Magician's Apprentice/The Witch's Familiar)
Martha Jones wore raven black tights when she meets Jack Harkness and Chantho well as Professor Yana, a human form of the War Master; (TV: Utopia) and when she learns Harold Saxon is the new Master. (TV: The Sound of Drums)
Li Shou Yuing wore crimson tights when she met the Seventh Doctor and Ace during their encounter with Morgaine and the Destroyer. (TV: Battlefield)
Mary, a renegade Arcateenian, wore burgundy tights. (TV: Greeks Bearing Gifts) ,
