Arwen (Liv Tyler) Lord of the Rings 2001. The movie is filled with tons of beautiful costumes but the one to showcase Arwen in promotions for the films is what is called "The Blood Dress." The name is attributed to the gorgeous velvet bell sleeve. It has a red underdress with gold embroidery and a dark burgundy over dress.
I love this head piece as her Queen's crown. It allows it to be a subtle headpiece without being too obnoxious. Also, since she is a fairy and flying around everywhere it allows it to be secure on her head and not have to worry about it falling off.