Masquerade - The Star Princess (worn by Christine Daaé) Dress was newly designed in for Broadway Opening in Notes: "Hombré (ombré) net skirt with under layers changing to blue inside." and "Will have to have dark plain trots as quick change to(o) fast.
Christine's "Don Juan" dress from the Phantom of the Opera film. Didn't like the film much (although I'm OBSESSED with the musical) but this dress is GORGEOUS, and it's what I based my first Steampunk outfit off of.
A costume worn by Emmy Rossum's stunt double as Christine in The Phantom of the Opera (Warner Bros., The costume is comprised of a yellow crepe dress with black overlay at bodice and down skirt with gold scarf at waist.