Every fall wardrobe has that one piece you reach for without thinking. For Jennifer Garner , Jessica Alba , and countless other celebrities? It’s a cardigan sweater, and Reese Witherspoon just wore the most classic version of the trend that makes the perfect outfit starter.

During a guest appearance on Dax Shepard’s Armchair Expert podcast, The Morning Show actress was spotted in a black cardigan sweater. The style is the ultimate chameleon — the neutral black hue pairs effortlessly with jeans, skirts, and dresses of all colors. The open-front design and buttons make it easy to layer, and the soft knit fabric is cozy and warm for winter.

Whether you’re dressing up for a meeting or are keeping it casual on the weekends, a timeless black cardigan is the staple you can wear all fall

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