Knitting was a hobby practised on Earth. It was also a way of producing items of clothing.
The Fourth Doctor enjoyed wearing a large scarf and said it had been knitted by Madame Nostradamus. (TV: The Ark in Space)
The Eighth Doctor once joked for the Sisterhood of Karn to bring him knitting when he had four minutes left to take the Elixir of Life and regenerate, which he considered to be "ages." (TV: The Night of the Doctor)
The Tenth Doctor thought that having four arms would be "brilliant", as it would always leave two arms free for some knitting while the other pair of arms was in use. (AUDIO: Infamy of the Zaross)
The Eleventh Doctor claimed to be late for either a biplane lesson or a knitting lesson in 1911. (TV: The Impossible Astronaut) He later read Knitting for Girls while waiting for the Teselecta crew, disguised as the late Gideon Vandaleur, to show themselves at a bar. (TV: The Wedding of River Song)
River Song enjoyed knitting. (COMIC: No Win, No Fez)
When Zorgo reached old age, the Twelfth Doctor suggested that he should take up knitting, adding that he thought knitting was "good". (COMIC: Zorgo the Terrible)