Cotton sundresses, with their breathable weave and flowing cut, offer a timeless, cool option for hot days, helping to lower body temperature with lighter, pastel-colored clothing.

Shopper-Approved: This short-sleeve sundress features tummy-concealing ruching and a breathable cotton base. It’s so popular, more than 1,000 Amazon shoppers purchased it in the past month. 3.

If you want your sundress to keep you cool, try to look for ones made of breathable materials like cotton, linen, or silk. With a Coordinated Tote Edward Berthelot/Getty Images ...

Linen dresses are this warm-weather season’s favorite. The lightweight fabric absorbs sweat, dries faster than cotton and is temperature-regulating.