It's the quintessential warm weather shirt and something of an icon of casual American style—the polo shirt. There are countless versions out in the market today from nearly every mass brand and designer label. But not all are created equal. The right polo needs to be cut from light, durable yet breathable cotton, with a close (but not restricting) fit and sleeves that are cut high and tight.

Shown left: $49.50 by J.Crew