Sundress refers to a dress with a Bodice styled to expose the arms, shoulders, and back, for wear during hot weather.
A sundress can be an A-line dress with an Empire waist. Moreove r, a sundress is a light loose sleeveless summer dress with a wide neckline and thin shoulder straps that expose the arms and shoulders.

Sundress should be made from light to medium weight woven fabrics such as linen, broadcloth, calico, chambray or seersucker. Ideal wear for summer time