Forget hair elastics — this spring you'll be tying up your hair using, wait for it, your own hair. How very meta. From Altuzarra to Ralph Lauren, stylists tied manes in hair knots to create loose, messy updos and sleek, sophisticated styles. The placement of these knots is also key, riding low on the neck. This keeps the style from looking too precious or ballerina, and instead lends itself to the cool, sophisticated-chick vibe we love so much.