According to Jack Harkness, fashion was a common subject of small talk. (PROSE: Slow Decay) Human fashion was constantly changing. (AUDIO: A Photograph to Remember)
Fashions were the subject of magazines such as Fashionista, (PROSE: Clean-up on Aisle Two) and books such as Karma and Flares. (PROSE: Alien Bodies)
The First Doctor consider his hair the height of fashion. (AUDIO: The Invention of Death)
Fashion trends were typically divided by decade, with certain trends seeing a revival in subsequent decades. The Thirteenth Doctor once tried to deduce from observing passersby whether she and Team TARDIS had landed in 1969 or an era where a fashion resurgence had occurred. (COMIC: A Little Help from My Friends)
ICE, a symbiotic life form disguised as clothing, took advantage of a 21st century fashion trend of wearing jackets and shades, engulfing and trapping their wearers inside them. (COMIC: Fashion Victims)