I've been having fun lately finding props and outfits that were used in more than one movie. Today milesadrift has a great example on her tumblr blog:
Above, Lucy, Desi, and a teeny tiny James Mason in "Forever, Darling" (1956). Apparently, Lucy got to keep some of her wardrobe from the film:
It's the same dress, only instead of the Auntie Mame-style coat dress worn over slacks, it's been shortened and the skirt sewn together. Neat.