$49 (from $295!) at Calypso St. Barth, one of my favorite shops, and always-stops whenever I'm in NYC.
It's called a skirt but it has that wide elastic band so, like shown here, it can be worn as a dress. The lace is really beautiful up close too, but hurry if you want it! It's final sale and there have been items on sale at Calypso I've hesitated on before which were then gone in a number of hours.
Merry Mardi Mes Amours!