Pyjamas were clothes that were worn in bed.
When Charlotte Pollard described Chief Stewart Weeks' nose as being "redder than Mr Lenin's pyjamas" on 4 October 1930, the Eighth Doctor disputed they were red; he claimed that they were a "sort of mauve" when the Doctor took a train with Lenin from Switzerland to Petrograd. (AUDIO: Storm Warning)
After his recent regeneration, the Tenth Doctor fought the Sycorax leader in the pyjamas he was given to wear by Jackie Tyler, which belonged to an acquaintance of hers. He commented on finding fruit in the dressing gown. (TV: The Christmas Invasion)