Loose thin blouses, help you stay cool but cover more.
Flowy skirts. Choose bright colors for even less heat.
Sandals
Beach dresses. Designed to be lightweight so they are perfect for summer. Find these in the swim area of your clothing store.
A modest swim suit, you don't have to pay a lot of money all you need is a workout top with the same fabric as an actual swim suit, and a pair of basket ball shorts or a workout skirt if you can find one. You can also find some water resistant leggings if your skirt has nothing under it or you need to cover some more leg.
Loghtweight shrugs are perfect for summer and come in a variety of colors and sleeve lengths. You can pair them with a cute tank top or cami or even a maxi dress or any sleeveless summer dress.