Do you have a knit polo yet? If not, you'll want one (or two or three) this spring and summer. These soft styles, knit from cotton, linen and silk, give you an immediate rich looking, throwback vibe. Like there's a sexy yet sophisticated energy knitted into each and every one. Decidedly more dressy than the standard cotton pique versions, these shirts have a luxe, worldly air to them—think The Talented Mr. Ripley's Dickie Greenleaf zipping through Italy on his Vespa. The cozy shirts can be worn with everything from chinos and shorts to a pair of equally right-now pleated pants. And if you don't want to wear a tie with your lightweight suit come wedding season, these look particularly chill under a jacket. In short, they're as easy to pull on as your everyday T-shirt, but with their stately collars and soothing textures, they make for a one-step move to nail sophisticated warm weather style.