No layer is more easy or versatile during the cool-warm-cold-again months of fall than a lightweight vest. Not the extremely puffy, down-filled versions meant for the rages of winter, but a simple, lightly insulated version—one that's resistant to wind and misty precipitation, but won't cause you to overheat when the sun's shining. Throw it over everything from a sweater or henley to a shirt and tie. What's more, most of these here are thin enough to layer under a jacket without adding too much bulk. From Barbour's all-weather model to Relwen's herringbone wool or the blanket stripes by the Burkman Bros., they're ideal for autumn's relaxed outdoor activities, whether you're playing some touch football or simply tailgating with buddies.