If you're suddenly finding yourself in need of a throw-on summer dress, we believe one of the best places to go is H&M for affordable but expensive-looking pieces. Whether you want something long and dramatic or mini with cut-outs, H&M has lots of beautiful casual dresses to choose from. The only thing to note about a good H&M dress is it tends to sell out pretty quickly, so we can't guarantee that the 16 below will be around for long. There are several details that the brand is leaning into for summer 2021, including double spaghetti straps, oversized puff sleeves, open backs with criss-cross straps and smocked bodices. Keep scrolling to see our edit of the 20 H&M dresses we love.