Penny Lovell, Rose Byrne
"I think it's really important to feel good and also comfortable
in a party look," says Penny Lovell
, who dresses Rose Byrne
and Mary Elizabeth Winstead
. "After all, it's the holidays. You are supposed to look great and, more important, have fun. Make sure your outfit isn't too tight; if need be, buy a dress in a size up and find an inexpensive tailor to alter it for you."