This has been super helpful for me.
Regarding steiconi, I have been looking at silk charmeuse. I really like the drape and how it's shiny without being tacky.
Cinderwench, I am a c-cup, so I'm definitely tightening the bodice. I do not have Keira's body at all. SHe can pull off the fluttering plunge, I most definitely can not.
Thesingingllamas, I definitely can't go to prom with that train, you're right. I think skimming the floor is the perfect length. I hadn't decided how long it was actually going to be yet but I can see that being very pretty.
The dress is actually a dress, not a pantsuit type thing. The bodice and the skirt are two different pieces. In fact, they had like 10 extra bodices and 12 skirts on set for if Keira's broke. That is helpful for me.
I have two super-stitcher moms on my side and I'm definitely going to go get some books from the library (thanks Cinderwench!) and like I've said, I have a lot of time before prom. I'm going to tackle some practice starting Thanksgiving break.
Thanks for all the advice! I'll keep plugging away.