Knitting was a hobby practised on Earth.
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 Eleventh Doctor evidently liked knitting to the point he didn't care if he looked into magazines about knitting that were not originally intended for gentlemen readers. He read Knitting for Girls while he waited for the Teselecta crew, disguised as the late Gideon Vandaleur, to show themselves at a bar. (TV: The Wedding of River Song)