Balmy summer evenings are great for lounging outdoors, preferably with a cocktail in hand. Sleeping through the sticky nights are a different story. Wearing an old tank top and shorts to bed can turn into hours of tossing and turning, especially if you opt to forgo the air conditioner. Enter the slip, a filmy lightweight piece that feels like you're wearing almost nothing at all. For the lingerie newbie, one like Fog Linen Work's white linen version or Anthropologie's whimsical polka dot chemise feel casual and soft against the skin, much like your trusty college tee. For those who are committed to splurging on a luxurious option, Stella McCartney and Samantha Chang both offer up subtly sexy styles that mix lace and silk and are worth the extra investment. Click ahead to see all of the airy options, perfect for the inevitable heat waves that are imminent.