And it's done! Um's dress is complete! The finishing touches involved gluing on little black velour hearts on the white parts of the bodice and overskirt. I used glue because I'm lazy.
I also made the shoes. They're not accurate: Alice's shoes have more red on them, which I might add, but I quite like them as they are. I made little loops of elastic, and sewed them to the shoes, then made a cord out of bias tape, and threaded it through.
Now all I need is a wig. I quite like the JC punk wig I found, but if anyone has any recommendations, I would love to hear about them.