This was a challenging and fun costume to make! I only had one reference picture to go by:
The director didn't want pink for the dress, so I suggested a silver/gray, which would look great with Ren's burgundy tux jacket. Once I found the fabric (a costume satin from Joanns) and the actresses' measurements (the part is double-cast, so I had to make two identical dresses), I got to work.
My starting point was a sheath sundress with a straight bodice. I took the pattern into Pattern Editor and created the points on the bottom edge of the skirt, where I would be attaching the sheer fabric godets.
Initially, I had half-circle godets in each of the six hem points. However, my husband managed to track down a clip of the final prom scene from the new movie on YouTube (which ended up getting pulled a day later, no doubt due to copyright issues), and I was able to see that the flare of the godets was MUCH more dramatic than just a half-circle of sheer could create. So I got more of the sheer fabric and added full-circle godet inserts on top of the half-circles. The end result is a dress with a fabulous flare!
The flounce around the upper bodice was a bit more tricky to figure out. I ended up making a double-layer flounce, serged together at the upper edge, and topstitched onto the bodice between the straps. For the part that goes around the arm, I zig-zagged elastic to the inner top edge so it would hug the actresses' arms without digging in.
Here is one of the actresses modeling her dress:
Here she is doing a twirl!
Here's a close-up of the godets:
One of the best moments I had was when the director looked at the costume, and asked me, "How do you do that?!?" When I asked her what she meant, she said, "How did you make the pattern?" I told her that I used a program to create the pattern. "Yes," she said, "but how did you copy the dress, just from a picture?" I told her I had years of practice from copying clothes from catalogs and web pictures. She just shook her head and said it was all just magic. That felt so great!!
Now I will finally have some time to do more sewing for myself. Well, actually, my extremely patient hubby will be getting a pair of trousers first. He deserves it.