If you have very short hair like Halle Berry, Stone says that you can mess it up a bit before the party or change it by adding a shaping product such as a paste.
For long hair, Stone recommends rolling your hair in the morning (he likes to use Caruso Steam Rollers). "Use bobby pins or pin curl clips to secure rather than their curler caps," he says. Leave curlers in for 20 to 30 minutes, then put your hair up in a ponytail for the workday. "That keeps the curl sort of set into it," he says. "For the party just let your ponytail down, turn your head upside down, get some spray in your roots and you can also tease your roots a bit and then flip your head back up to give yourself volume. That is going to give you a full-bodied holiday look…tease at the crown for a terrific 'Mad Men'-like bouffant."