Looking for the perfect shirt to wear under your new winter suit for those days when you've got important meeting after important meeting? Look no further. J. Crew has updated its traditional women's button-down, and the three-button cuffs and snazzy stripes will make you feel professional even when those meetings turn into snoozers. I like the Kathryn design, which uses smooth cotton broadcloth and is designed with a close fit and tails long enough to stay tucked in.