For a casual wedding, you'll want to look fresh and summery. A simple sundress will look just right when you're out in the sunshine, and the bright cheerful color of this relaxed fabric will look just right at a casual daytime wedding.
You could also wear a similar dress for a daytime casual wedding. It will be comfortable yet look pulled-together.
Suzi Chin Maggy Boutique Surplice Bodice Sundress