Playboy model Crystal McCahill is set to costar in directors Robert Rodriguez and Frank Miller’s long-awaited Sin City sequel A Dame to Kill For. No word on what role the busty (36-DDs!), 5-foot-7 stunner will play, but it does involve this outfit.

A Dame to Kill For is based on Miller’s comic of the same name, published in 1993 by Dark Horse Comics. The story is adapted for the screen by Miller and Rodriguez. Production began on Oct. 29 at Rodriguez’s Troublemaker Studios in Austin, Texas.

McCahill, the May 2009 Playboy Playmate of the Month and former recurring on E!’s Playboy reality series “The Girls Next Door,” joins a cast that includes returning cast members Jessica Alba, Rosario Dawson, Mickey Rourke and newcomers Jaime King and Jamie Chung.

Sin City: A Dame to Kill For is slated for release Oct. 4.