The Doctor's TARDIS contained a wardrobe. Throughout their lives, the Doctor and their companions used the wardrobe on several occasions.
The wardrobe was already home to a vast collection of clothing when the First Doctor and Susan stole the TARDIS. (PROSE: The Exiles)
Vicki Pallister, correctly inferring that the TARDIS was not the Doctor's original property, believed a previous owner collected clothing for cultural and historical analysis. (PROSE: The Plotters)
After regenerating, the Seventh Doctor went to the wardrobe and dressep up several outfits, including those of his fifth incarnation. (TV: Time and the Rani)
By the time of his tenth incarnation, the wardrobe was a lot bigger, containing even a spiral staircase within it. (TV: The Christmas Invasion)