Annabeth played the Ghost of Christmas Past in this production. She needed a dress that was a cool white, Regency-style preferred. We used Simplicity 4055 view A with modifications (linking to the Pattern Review page for this pattern since Simplicity's new website is a disaster).
We used a crepe satin for the base layer, and a textured chiffon for the overlay. We raised the neckline., and closed it with a zipper -- much better for quick changes. Annabeth hated the cap sleeves, so I lengthened them to about elbow length, then added fabric hanging on down to her wrists.
The overlay turned out to look like a fairly stupid effect in these fabrics, so we ended up adding a ruffle of chiffon to the bottom of the base dress. It gave a suitably droopy diaphanous, dead look.
It turned out to look a bit like a nightgown, unfortunately. But, hey, Scrooge was in his dressing gown, so maybe that was okay.
Overall, this was a GREAT show. The kids were absolutely marvelous in it, and wonderful to work with. The costume committee was super, too -- a great group of women who did far, far more work than my small contributions. The theater seats around 400, and three of the four performances sold out.