TARDIS wardrobe

The Doctor's TARDIS contained an wardrobe. Throughout their lives, the Doctor and their companions used the wardrobe on several occasions.

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)