Book: Dressed: A Century of Hollywood Costume Design.
I took a peek at this book at Barnes and Noble the other day. It really is a beautiful book. The photographs and costume illustrations are really high quality. There are chapters on costume design for each of the last 10 decades, then there are the gorgeous photos (lots and lots of color), many sketches, and captions that go along with the images. The captions are quotes from directors, actors and designers. I would definitely recommend this book for anyone who loves movies.