Best Bet: Gap’s Zip-Back Stripe Top

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A subtle twist on a classic staple, this navy-and-white striped tee sports an exposed zipper on the back, which makes it feel even straighter and more slim-fitting than a boxy T-shirt. With heavy cotton knit and nautical Breton stripes, it's a necessity in any closet. 

Gap Zip-Back Stripe Top, $30 at Gap.