First, consider a few layers. "The longest styles look even longer right after a good cut that adds movement even if it takes off half an inch," says NYC stylist Ted Gibson.
If you haven't gotten to the stylist yet, use a curling iron and roll two- to three-inch sections halfway up the barrel.
Spritz with hairspray and then pull the curls out so they turn into long, loose waves at the bottom. You'll get the same kind of bouncy look you'd get after a $200 haircut.