5. Add Layers
Hair that's all one length is heavy and falls flat, while a subtly layered cut that hits between your chin and shoulders can build body, says Kevin Mancuso, creative director of Nexxus Salon Hair Care.
6. Consider Color
The slight cuticle damage you get from tinting your tresses can make hair appear thicker, says Anderson. If you don't dye your hair, fake the strand-plumping effect by applying dry shampoo to your roots. The powder absorbs volume-sapping scalp oil and coats hair to make it feel denser. We like René Furterer Naturia Dry Shampoo ($24; sephora.com), which contains softening botanicals.
7. Give Piece(s) a Chance
Extensions that blend in with your natural length can be added to the sides of your hair to create fullness. Try Hairdo by Ken Paves 10 Piece Human Hair Clip-In Extensions ($295; hairuwear.com), which come in an array of colors.
8. Keep Your Hands Off!
"The less you mess with your mane, the longer your style will last," says DeVincenzo. Before you leave the house, use a quick spritz of a flexible spray, like Aveda Witch Hazel Hairspray ($12; aveda.com), and give hair a slight finger fluffing at the roots. To revive your do later in the day, flip your hair upside down and either lightly massage your scalp or heat it with a blowdryer to reactivate your volumizing products.