I decided I wanted a simple, easy-to-wear costume to have on hand and this...isn't it, but it was a lot of fun.
The black minidress is a heavily-altered variant on the same bodice pattern I use every. freaking. year (McCall's 4109, for those interested), and the white is a cannibalized button-down shirt and some ruffles I threw together. There are a few things about this I'd like to fix, particularly the wig styling, but overall I'm pretty happy with it.
I say unto you verily, high heels are death.