Polka dots are popular right now, and Middleton hopped on the trend with a white and black midi dress. This spaghetti-strap style is the perfect way to try the look for the summer.

I am a big girl with a 40DD chest, so I have to wear a bra with straps. Bought this for a Hawaii vacation and it was perfect! Flattering, simple, could dress up or dress down," raved one customer.

Loose, flowy garments are usually a better choice on sweltering days. The exception: technical fabrics, like those used in athleisure, are often specifically designed to wick away sweat, Song says.