Yami (Atem), Yami Marik and Yami Bakura switched outfits with each other, as well as their Millennium Items

Yami (Atem) has Yami Bakura's outfit and his Millennium Ring

Yami Bakura had Yami Marik's outfit and his Millennium Rod

Yami Marik had Yami's (Atem's) outfit and his Millennium Puzzle