Whenever we're thinking about our list of must-have basics, the first thing that comes to mind is always a crisp, white button-down shirt. It's a go-to option for the office, but it can be sexy, too, if you're daring enough to leave a few buttons undone or tie the tails into a knot around your waist. Plus, it looks stylish with just about anything, including a pair of plain black jeans — as demonstrated by Angelina Jolie over the weekend.