I'm watching this thread as I am in need of one, too. I have the Renee Greenstein set and I have the Joan Rivers maxi with the elastic waistband.
I specifically need something that is packable without wrinkling. I am flying to Colorado for a garden wedding in the mountains and won't be staying near a town with a dry cleaner for pressing. We arrive late evening the day before the wedding and the last thing I want to be dealing with is ironing!
I'll use one of the maxi's I've got if I don't find another but none of them are tripping my trigger. The Renee dresses are black and a black and white pattern and I don't want to wear black to an afternoon garden wedding.