Fashion
From Tardis Wiki, the free Doctor Who reference
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)
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)