Meryl Streep and Amy Adams premiered their new film, 'Doubt,' at the AFI Fest in Hollywood last night, and they discussed the unusual clothing they wore in the film.

"The habit… it got to be a habit," Meryl deadpanned for ET cameras on dressing in the classic nun's uniform for her latest drama. "What I wore in the movie was so easy, it lacked all vanity and I didn't have to suck in, so I almost prefer it," Amy commented.

Doubt also co-stars Philip Seymour Hoffman and Viola Davis, and hits theaters on December 12.