Mary-Kate and Ashley Olsen's Hairstylist Told Us 9 Ways to Fake Thicker Hair

According to Townsend,

the next best haircut for those looking to make their hair look thicker would be a longer version of the above—a lob that falls just at the shoulder. 

"I love what Natalie Portman's been doing with this cut, because she really demonstrates all the different ways you can wear it and how wonderfully it works for different hair textures," Townsend explains. "She's worn it curly, straight, sleek—by graduating to the shoulder, you still have enough length for updos, chignons, or even top-knots, so you get a little more flexibility and versatility with styling.

"Also, when it's right at the shoulder and blown out straight, I love the movement it gives the hair when it hits the shoulder—it has to break either in the front of or behind the shoulder—which gives really beautiful movement and is a really great way of faking the look of fuller hair."

Townsend also explains that for bobs and lobs, the ends should be blunt. There are layers in there, but they're cut from the top which gives lift and movement at the root without making the ends look thin. The blunter the ends are, the thicker the hair will look.