Lapel

A lapel was a part of a coat or jacket.

Worn by the Doctor

The First Doctor had peaked lapels on his double-breasted frock coat of plain black velvet. (TV: An Unearthly Child-The Tenth Planet, The Three Doctors, The Five Doctors, The Day of the Doctor, Twice Upon A Time)

The Third Doctor wore velvet blazers. Some had notched lapels. (TV: The Green Death, Invasion of the Dinosaurs, Death to the Daleks) He also wore some with peaked lapels. (TV: Carnival of Monsters, Planet of the Daleks, The Monster of Peladon, Planet of the Spiders [+])

The Fifth Doctor had notched lapels with scarlet trims on his beige frock coat, (TV: Castrovalva-Warriors of the Deep) and also on his silver grey overcoat. (TV: The Awakening-The Caves of Androzani)

The Sixth Doctor's rainbow frock coat featured amber and pink lapels. (TV: The Twin Dilemma-Time and the Rani, The Day of the Doctor)

The Seventh Doctor wore single-breasted blazers with notched collars; one of silver grey cotton, (TV: Time and the Rani [+]) chocolate brown cotton, (TV: Battlefield [+]) one of cream linen, (PROSE: White Darkness [+]) and one of tan herringbone-tweed. (TV: Doctor Who [+])

The Eighth Doctor had peaked lapels on his double-breasted frockcoats of velvet, (TV: Doctor Who) his double-breasted peacoat of navy blue leather, (AUDIO: Fugitives) and his double-breasted overcoats of moleskin. (TV: The Night of the Doctor)

The War Doctor had peaked lapels on his double-breasted trenchcoats of leather. (COMIC: The Clockwise War, Ambush, The Lost Dimension, The Whole Thing's Bananas, First Rule-Fast Asleep, 'Four Doctors; AUDIO: Lion Hearts, The Shadow Squad) Consequences, Destroyer|Saviour), The Keeper of Light, Temmosus, Rewind, The Mission-The Horror, A Mother's Love, Berserker, Memnos, The Hybrid's Choice-Exit Strategy, In Name Only, The Innocent-The Heart of the Battle, Legion of the Lost, A Thing of Guile, The Neverwhen, The Shadow Vortex, The Eternity Cage, Eye of Harmony, Pretty Lies, The Lady of Osidian-The Enigma Dimension; PROSE: Engines of War; TV: The Name of the Doctor, The Day of the Doctor)

The Ninth Doctor had peaked lapels on his black frock coat during 1912. (PROSE: Have You Seen This Man?; TV: Rose [+]) He also had peaked lapels on his double-breasted peacoat of black leather. (TV: Rose-The Parting of the Ways)

The Tenth Doctor had peaked lapels on his double-breasted overcoat of cinnamon brown Alcantara with a royal blue lining, and notched lapels on his single-breasted blazers of pinstripe. (TV: The Christmas Invasion ^[+]-The End of Time ^[+])

The Eleventh Doctor had notched lapels on his single-breasted blazers of tweed.(TV: The Eleventh Hour, The Belly of the Beast, Victory of the Daleks, The Time of Angels|Flesh and Stone, The Vampires of Venice, Amy's Choice, The Hungry Earth|Cold Blood, Vincent and the Doctor, The Pandorica Opens|The Big Bang, A Christmas Carol, The Impossible Astronaut|Day of the Moon, The Curse of the Black Spot, The Rebel FLesh|The Almost People, A Good Man Goes to War, The God Complex, Asylum of the Daleks, Dinosaurs on a Spaceship, A Town Called Mercy, The Power of Three, The Angels Take Manhattan; GAME: City of the Daleks, Blood of the Cybermen, TARDIS, Shadows of the Vashta Nerada, The Gunpowder Plot, The Eternity Clock) He also had peaked lapels on his army green greatcoat. (TV: Let's Kill Hitler, The Girl Who Waited, Closing Time, The Wedding of River Song); and on a black greatcoat.(TV: A Town Called Mercy)

The Fourteenth Doctor had lapels on his double-breasted overcoat of navy blue tweed. (TV: The Power of the Doctor-The Giggle; COMIC: Liberation of the Daleks)

The Fifteenth Doctor had peaked lapels on his double-breasted overcoat of burnt orange leather. (TV: The Church on Ruby Road, Space Babies; COMIC: Mancopolis)

The Warrior, a parallel version of the Doctor's fifth incarnation which looks similar to the sixth, had lapels on a double-breasted trenchcoat of chocolate brown leather similar to the War Doctor of N-Space. (AUDIO: Aftershocks [+])

Worn by Companions

Yasmin Khan had notched lapels on her sage green blazer. (TV: Demons of the Punjab) She also wore riding habits with small lapels; one of navy blue cotton, (TV: Nikola Tesla's Night of Terror) and one of bottle green herringbone-tweed. (TV: Survivors of the Flux|The Vanquishers)

Bill Potts had peaked lapels on her navy blue peacoat. (TV: The Lie of the Land)

Worn by the Master

The UNIT Master had notched lapels on blazers he wore. (TV: Terror of the Autons; AUDIO: Terror of the Master)

The Tremas Master had notched lapels on his blazers. (TV: Survival)

The Bruce Master had peaked lapels on a black leather trenchcoat during the 2223 Dalek invasion of Earth, (AUDIO: Faustian- Passion) and when he met River Song in the Time Vortex. (AUDIO: The Lifeboat and the Deathboat)

The War Master had notched lapels on tweed blazers done in charcoal, (AUDIO: The Heavenly Paradigm [+]) or olive green; (AUDIO: The Sincerest Form of Flattery [+]). He also had peaked lapels a maroon moleskin overcoat, (AUDIO: Master of Worlds [+]) or a battleship grey tweed frock coat. (AUDIO: Masterful [+])

The Saxon Master had notched lapels on his black blazers. (TV: The Sound of Drums|Last of the Time Lords)

Missy had black-trimmed lapels on her riding habits. (TV: Deep Breath-The Doctor Falls)

The Spy Master had peaked lapels on his leather trenchcoat when posing as a Nazi. (TV: Spyfall)

Worn by Others

Ianto Jones had peaked lapels on his ebony black leather trenchcoat. (AUDIO: Ex Machina)

Vienna Salvatori who dwelled during the 2223 Dalek invasion of Earth wore leather trenchcoats with peaked lapels done in navy, (AUDIO: The Shadow Heart [+] - Vengeance [+]) or ebony black. (AUDIO: Nemesis Express [+] - Passion [+])