How to grow a pixie to a bob.
If you have a pixie and want a bob, grow your hair out to one length. Avoid cutting layers with wispy ends, which can look dated. The toughest part about the process is letting your top layer grow, because as it does, it tends to look poufy. Manage this by getting a smoothing treatment at the salon (like keratin) or applying a straightening cream to damp hair then blow-drying it smooth.
How to grow a bob to long hair.
If you’re going from a bob to long hair, keep your layers as long as possible. If you over layer it, the style will look old-fashioned. If you have a round face, cut the back shorter than the front for a slimming effect. Invest in a texturizing spray to create rumpled waves, which will help disguise any weird lines in your hair. A good one: Oribe Dry Texturizing Spray ($42, birchbox.com).
How to grow out bangs.
Growing out your bangs will give the illusion that your hair is longer. Part them in the center or slightly off to the side. The less severe the part, the easier the process will be, so skip the side swoop. To prevent them from falling in your face, mist a lightweight spray gel on wet roots, then blow-dry them back with a round brush. This will encourage the roots to lift, and when your hair does fall to the side, it won’t be flat against your face. Once the pieces are long enough, twist or braid them before securing to the side with a black pin.