There are certain items--white shirts, black socks, khakis--a man can never have too many of. Add the striped crewneck to that list. You need a cotton one for the summer, cashmere for the winter, and for those in-between-times, something less predictable, like these mohair kruits. Slightly rough to the touch, they come in attractive color combos: gray and mauve, black and oatmeal, teal and gray. Wearing one is like putting on a suit with two days' worth of stubble--you'll look well-dressed, but with a rebellious streak.
Sweaters ($515 each) by Marc Jacobs.