Chloé, Stella McCartney, Costume National and Guy Laroche all showed some version of the "I just got out of bed" look. Happily, bedhead is ridiculously easy to do.
GET THE LOOK: If you have naturally wavy hair, Bailly recommends washing at night and letting it air-dry. Don't even part or brush it; you don't want it to look too perfect. In the morning, rub a light serum on your palms and gently pat down any flyaways. If your hair doesn't have natural wave, wash it the night before, let it air dry, but in the morning, use a large-barrel curling iron on three-inch sections of hair, and apply a texturizing spray to add volume as you curl. After you're done, brush through the curls and use a small amount of serum to pat down flyaways. If you have fine hair, or are going for a slightly more polished look than "I just woke up," hold the curling iron at your crown for a few minutes to get some height, Monroe says. You'll still have soft waves, but it will be clear you spent some time on it. (See our no-snip makeovers for a great example of polished waves.)