Clothing was material made for covering the body. To not wear clothing was to be naked, which was required to visit the Papal Mainframe, (TV: The Time of the Doctor) and favoured by Raxacoricofallapatorians such as the Slitheen. (TV: World War Three)
In 1190, a chamberlain serving in Richard the Lionheart's court recognised the clothing worn by the First Doctor and Vicki Pallister as belonging to the palace. (TV: The Crusade)
The aliens that Andrew met on three subsequent Saturdays thought he was a different incarnation of the Doctor based on the clothing he was wearing at the time. (PROSE: The Andrew Invasion)
Kymbra Chimeras were unable to accurately copy clothing, so it appeared fused to their flesh. (COMIC: Changes)
The Blue, Red and Yellow Kangs had hair and clothing coloured to match their tribal name. (TV: Paradise Towers)
A hologram shell was worn by Saibra to replicate clothing, allowing her to efficiently disguise herself in conjunction with her own ability as a mutant human to morph by replicating living cells. (TV: Time Heist)