Here's a quintessential D.C. question for you: Who actually wants to get married outdoors in Washington at the height of summer? Answer: realistically, probably no one. Temperatures are steamy at best; scorching at worst. And it's brutal.That said, people do, indeed, tie the knot on sweltering days, and the fear of being sweaty is not enough of a reason to withhold your RSVP. Instead, support your friends by celebrating their blessed union in a lightweight, breezy, absolutely gorgeous frock that'll keep you as cool as possible. And don't worry, we've done the legwork for you and rounded up a bevy of worthy contenders — classy, covetable options you'll want to wear long after the reception is just another hungover memory.