There is an anime where the heroine has a piece of clothing that gives her power, but it will eat her up.

"KILL la KILL (キルラキル)" is a passionate fantasy original TV animation created by Kazuki Nakajima and directed by Hiroyuki Imaishi. The official tagline is "Dress, slay, hunger, demonize, and survive to finally rip the world apart!". The animation is set in the Honnōji Academy dominated by force and terror. It tells the story of a young girl, Mataro, who comes to Honnōji Academy as a transfer student in order to find her father's enemy and has an affair with Oni, the student council president who dominates the important forces in the academy. The story of Ryuuin Satsuki’s battle with the Four Heavenly Kings of the Student Council.