I've done some browsing, but nothing I've seen seems to be a good fit: I need a summer dress to wear to a wedding rehearsal dinner in August (in the American South, so it'll be HOT).

I'm looking for something preferably knee-length and with sleeves. I'm a size 14w-16w petite pear shape, and love fit-and-flare styles, though I'm open to fashion wisdom on what else might work, too! The rehearsal and dinner are deliberately casual, but I'm the bride's honor attendant so a smart casual option would be fine.

Has anyone run across or can recommend a dress that might work? Thanks!