Trousers
Trousers were an item of clothing typically worn to cover the legs. A suit which included trousers was known as a trouser suit.
Worn by the Doctor
The First Doctor wore grey tartan trousers. (TV: An Unearthly Child) right up to his fall after the Mondasian Cyberman 1986 invasion of Earth. (TV: The Tenth Planet, Twice Upon A Time)
The Second Doctor wore tartan trousers done in grey, (TV: The Power of the Daleks-The War Games, The Three Doctors, The Five Doctors, The Two Doctors) or yellow with green stripes. (COMIC: Comic Relief Comic)
The Third Doctor wore black trousers. (TV: Spearhead from Space) right up to his end after saving many from the giant spiders of Metebelis III. (TV: Planet of the Spiders)
The Fourth Doctor spent his first hours in the Third Doctor's black trousers. He eventually wore grey tweed trousers. (TV: Robot, etc) He also wore burgundy ones, (TV: The Leisure Hive) right up to his fall. (TV: Logopolis)
The Fifth Doctor spent his first hours in the Fourth Doctor's trousers before switching for brown stripe trousers. (TV: Castrovalva-Warriors of the Deep) He also switched for coral-striped ones, (TV: The Awakening) right up to his fall. (TV: The Caves of Androzani)
The Sixth Doctor spent his first hours in the Fifth Doctor's trousers. (TV: The Caves of Androzani) He typically wore royal yellow trousers with black stripes. (TV: The Twin Dilemma-Time and the Rani) While acting as his successor, Jack Harkness wore the Sixth Doctor's coat along with his seventh favourite waistcoat and yellow-stripped trousers. (AUDIO: Piece of Mind)
The Seventh Doctor wore plaid trousers done in grey brown, (TV: Time and the Rani-Survival) or green. (TV: Doctor Who)
The Eighth Doctor wore trousers done in moss green, (TV: Doctor Who) mauve, (COMIC: Dreadnought) sapphire blue, (AUDIO: Time Works) fern green, (AUDIO: Absolution) scarlet, (PROSE: The Eye of the Tyger) or tan brown. (COMIC: The Pictures of Josephine Day) right to his fall on Karn. (TV: The Night of the Doctor)
Throughout his life, the War Doctor wore tan trousers (COMIC: The Clockwise War, The Lost Dimension, The Whole Thing's Bananas, WC: Doctors Assemble) right up to his death after the Fall of Gallifrey. (TV: The Day of the Doctor)
The Tenth Doctor wore trouser suits of pinstripe done on dark brown and light blue, (TV: The Christmas Invasion-The End of Time, The Day of the Doctor) or navy and crimson. (TV: Smith and Jones-Dreamland) He also wore black trousers as part of his tuxedos. (TV: Rise of the Cybermen/The Age of Steel, The Lazarus Experiment, Voyage of the Damned)
The Eleventh Doctor initially wore midnight blue trousers. (TV: The Eleventh Hour)
The Twelfth Doctor wore plain trousers done in indigo, (TV: Deep Breath) or black. (TV: Under the Lake) He also wore baggy plaid trousers in gunmetal grey, (TV: The Doctor's Meditation) Prussian blue and alabaster, (TV: The Girl Who Died) navy and crimson, (TV: The Woman Who Lived) or bottle green. (COMIC: The Ministry of Time)
The Thirteenth Doctor wore teal capri trousers. (TV: The Woman Who Fell to Earth-The Power of the Doctor) She also wore black trousers as part of her tuxedo. (TV: Spyfall)
The Fourteenth Doctor wore trousers of maroon and turquoise tartan, (TV: The Power of the Doctor) before switching for some done in plum and black. (COMIC: Liberation of the Daleks)
The Fifteenth Doctor wore trousers of caramel brown tweed with black overchecks when on the lookout for trouble. He also wore some in plain blue. (TV: The Church on Ruby Road) Prussian blue, (TV: The Devil's Chord) or plain tan. (TV: Boom)
A child incarnation of the Doctor bound to a high-tech wheelchair wore trousers of charcoal and ebony tartan. (PROSE: Rose)
The Curator, a future version of the Doctor, wore mahogany trousers when he looked similar to the Fourth Doctor. (TV: The Day of the Doctor)
Worn by the Master
The Master wore trousers on many colours.
The UNIT Master wore black trousers. (TV: Terror of the Autons-Frontier in Space)
The Tremas Master wore black trousers. (TV: Logopolis-Survival)
The War Master wore black trousers, (AUDIO: Beneath the Viscoid) Day of the Master, Masterful) up to his death. (TV: Utopia)
When posing as Harold Saxon, the Saxon Master wore a black trouser suit. (TV: The Sound of Drums/Last of the Time Lords) He also wore gunmetal cargo trousers when in hiding, (TV: The End of Time) then wore dark trousers up to his death. (TV: The Doctor Falls)
The Spy Master wore black tuxedo trousers when posing as O. He briefly wore black trousers when he met the Thirteenth Doctor on London during 1834, then wore khaki green trousers when posing as a Nazi on Paris during 1941. (TV: Spyfall) Mainly, he wore navy trousers with orange plaid symbols. (TV: Spyfall-The Timeless Children) He also wore trousers done in charcoal tweed or black cotton as well as the Thirteenth Doctor's capris when possessing her body. (TV: The Power of the Doctor)
Worn by companions
Barbara Wright wore black trousers with her jumpers. (TV: The Keys of Marinus, The Web Planet, The Space Museum, The Chase, et al.)
Sarah Jane Smith gained camouflaged trousers from Skaro during the Dalek's origins, (TV: Genesis of the Daleks) and also wore it during her encounter with Nomad Cybermen. (TV: Revenge of the Cybermen) She also wore mauve trousers met Morbius, Solon, Condo, and the Sisterhood of Karn. (TV: The Brain of Morbius)
Polly Wright wore black trousers when she helped to fight Telosian Cybermen on the Moonbase during 2070. (TV: The Moonbase)
Victoria Waterfield wore chestnut brown trousers when she first met the Great Intelligence and some Robot Yeti on Tibet during 1935, (TV: The Abominable Snowmen) and when she met Ice Warriors on Brittanicus Base. (TV: The Ice Warriors)
Jo Grant wore trousers in black, (TV: Terror of the Autons) ivory, (TV: The Sea Devils) charcoal, (TV: Frontier in Space)and chocolate brown. (TV: Colony in Space, Planet of the Daleks)
Romana II wore trousers in rose pink, (TV: Destiny of the Daleks) or raven black. (TV: Dimensions in Time)
Nyssa wore trousers of plum purple velvet. (TV: Four to Doomsday, The Visitation, Black Orchid, Earthshock, Time Flight, Arc of Infinity)
Peri Brown wore trousers done in burgundy, (TV: Revelation of the Daleks) steel blue, (TV: The Mysterious Planet) or crimson. (TV: Dimensions in Time)
Ace wore black trousers during her travels. (TV: Battlefield-Survival) She wore black trousers as part of her tuxedo when she went to Gabriel Chase on 1883. (TV: Ghost Light) During her time as CEO of A Charitable Earth, she wore a black and white pinstripe trouser suit. (AUDIO: Quantum of Axos; TV: The Power of the Doctor)
Romana II wore trousers of rose pink cashmere during the Movellan Incident, (TV: Destiny of the Daleks) and when helping to foil the Tremas Master and Autons. (COMIC: Endgame)
Grace Holloway wore gunmetal grey trousers when she helped the Eighth Doctor. (TV: Doctor Who)
Charlotte Pollard wore black trousers. (GAME: Legacy)
Cinder wore camouflaged trousers. (COMIC: The Bidding War, Relative Dimensions)
Rose Tyler's personal growth during her travels with the Doctor began to reflect itself in her clothing choices as she became more confident and assertive, swapping her jeans for slim black trousers. (TV: The Long Game, Bad Wolf/The Parting of the Ways, New Earth, Fear Her, Army of Ghosts/Doomsday, The Stolen Earth'/Journey's End)
Martha Jones wore black trousers, (TV: Smith and Jones, The Sontaran Strategem; AUDIO: Dissected) as did her clone during the 2009 Sontaran Invasion of Earth. (TV: The Sontaran Strategem/The Poison Sky)
While investigating Adipose Industries in 2009, Donna Noble wore a black trouser suit on Wednesday. (TV: Partners in Crime)
Leela wore ebony black trousers during the Fang Rock incident. (TV: Horror of Fang Rock)
Tara Mishra wore olive green trousers when she meets Rose Tyler and the Ninth Doctor. (COMIC: The Bidding War)
Jackson Lake wore ebony black trousers when he and Rosita Farisi helped the Tenth Doctor to defeat Cybermen from Pete's World during the 1851 Incident. (TV: The Next Doctor)
Jenny Flint wore tan trousers during the Battle of Demons Run. (TV: A Good Man Goes to War)
Dan Lewis wore tan trousers during the early 1900s. (TV: Survivors of the Flux|The Vanquishers)
Melanie Bush wore white trousers when she and the Seventh Doctor foiled the First Rani. (TV: Time and the Rani) She also wore black trousers when she met the Fourteenth Doctor and Donna Noble, and witnessed the Toymaker's defeat and the Fifteenth Doctor’s birth. (TV: The Giggle)
Liz Shaw wore trousers in ebony black, (TV: Dimensions in Time) or midnight blue. (AUDIO: Intelligence for War)
Romana II wore trousers in beige when she met Great Vampires. (TV: State of Decay) She also wore indigo trousers when she decided to stay in order to help Tharils to escape slavery. (TV: Warrior's Gate)
Brian, an Ood assassin, wore black trousers as part of his tuxedo. (PROSE: The Guide to the Dark Times, The Knight, The Fool and The Dead)
Others
At Coal Hill School in the 1960s, girls were not permitted to wear trousers. Basil James Carker, the headmaster, had turned down dozens of petitions that girls be allowed to wear trousers to school. They instead had to wear skirts or tunics. Susan Foreman commented in her diary that "[she thought] he'd be happiest if we had to wear Mohammedan veils and Idaho potato-sacks". (PROSE: Time and Relative)
Ianto Jones used a trouser press. (AUDIO: Believe)
Cathy Salt wore a brown trouser suit. (TV: Boom Town)
Penny Carter wore a grey trouser suit. (TV: Partners in Crime)
John Riddell, an Edwardian hunter, wore tan trousers when he met Queen Nefertiti and helped rescue dinosaurs on a Silurian Ark during 2367. (TV: Dinosaurs on a Spaceship)
Allison Williams wore tan trousers when she helped the Seventh Doctor during the Hand of Omega Incident. (TV: Remembrance of the Daleks)
Henry Van Statten wore a black and white pinstripe trouser suit during the Van Statten Incident. (TV: Dalek)
Winston Churchill who was prime minister for Britain during World War 2 wore black trousers; (TV: Victory of the Daleks) as did his parallel counterpart who was Holy Roman Emperor on River Song's World. (TV: The Wedding of River Song)
Kyle wore bottle green trousers, up to when she was killed by a Neomorph Cyberman during the 2526 Cyber-Invasion of Earth. (TV: Earthshock)
Diane Holmes wore olive trousers while adapting to the 21st century. (TV: Out of Time)
Eustacius Jericho wore charcoal grey trousers during the early 1900s. (TV: Survivors of the Flux, The Vanquishers)
Shirley Bingham wore trousers done in rust orange, (TV: The Star Beast) and raven black. (TV: The Giggle)
Diagoras wore a black pinstripe trouser suit as did Dalek Sec when he fused with him to become a Human Dalek during the Human Hybrid Incident. (TV: Daleks in Manhattan/Evolution of the Daleks)
The Ringmaster of the Psychic Circus wore maroon gingham trousers. (TV: The Greatest Show in the Galaxy)
Mr Copper wore olive tweed trousers. Bannakaffalatta and Rickston Slade wore black trousers as part of their tuxedos. (TV: Voyage of the Damned)
Jackson Lake wore ebony black trousers when he and Rosita helped the Tenth Doctor foil some Cybus Cybermen on London during the year 1851. (TV: The Next Doctor)
The Toymaker wore black trousers when mock dancing with the Fourteenth Doctor. He also wore tan trousers in Soho during 1925, and khaki cargo trousers up to his defeat. (TV: The Giggle)
Vienna Salvatori wore charcoal trousers. (AUDIO: The Shadow Heart-Vengeance)
Harriet Jones wore ebony black trousers when she sacrificed herself to bring the Tenth Doctor to where the New Dalek Empire hid Earth during the Planetary Relocation Incident. (TV: The Stolen Earth)
The Editor of Satellite Five wore navy trousers. (TV: The Long Game)
The Valeyard wore copies of the Eighth Doctor's tan trousers. (AUDIO: The War Valeyard)
The Half-Face Man wore charcoal pinstripe trousers during the 1890s. (TV: Deep Breath)
Ambrose Northover wore black trousers during her first encounter with Silurians including when she betrayed the Eleventh Doctor, killed Alaya, and almost doomed her people to Restac during the Cwmtaff incident. (TV: The Hungry Earth|Cold Blood)
Having sustained a severe leg wound, blood was spread across Stella's trousers. (PROSE: Prisoner of the Daleks)
When working with the thermocoupling]s in the Doctor's TARDIS, Rory Williams became distracted by Amy Pond's skirt, visible through the glass floor, and dropped the coupling, causing the TARDIS to materialise inside itself. (TV: Space) After the mess had been sorted, the Eleventh Doctor told Amy to put some trousers on. (TV: Time)
Behind the scenes
Information from invalid sources
Deborah (as played by Minnie Driver in the Doctor Who serial Father Time) had a "dowdy" appearance, as described by a costume designer, executed using unflattering jumpers and corduroy trousers. (PROSE: Father Time: "Set Visit" [+]Loading...["Father Time: \"Set Visit\" (short story)"])
