On the hottest summer days, even shorts and a t-shirt can feel oppressive. Sometimes the only smart option is to slip into an easy, breezy sundress, one that is lightweight enough to feel like you're wearing almost nothing - while still being cute enough to ensure you look stylish. The key is opting for a breathable fabric that will feel airy even when there's no breeze in sight. Think cotton, linen or even viscose, all of which are light and comfortable. You should also prioritize sleeveless tops, flowy skirts that move with you and a loose fit that feels more versatile.