Whether you throw it on before brunch with friends, pull it on after a long flight has wreaked havoc on your hair, or use it to hide your unwashed tresses on a camping trip, a versatile knit hat is a must for summer. The Linocut Beret from Interweave Knits Accessories 2011 features a stunning lace pattern that pops in a light, summery color. Plus, the slouchy fit is super trendy and super cooling. We've rounded up some other lightweight, lacy hats that won't make your head too hot on the blog!