[Hot damn. -egg]
TARDIS dress is bigger on the inside: 
Jere7my sez, “This lovely young woman brought the house down at Arisia this year with her stunning “TARDIS Princess” dress. A “door” on the skirt opened to show the TARDIS control room, giving it the illusion of being “bigger on the inside”… I believe the creator/model is Sasha Trabane.”
(Thanks, Jere7my!)