Flannel shirts are trending, and it's no surprise why - they're cozy, stylish and perfect for the cooler months ahead. If you're looking to upgrade your closet with the trusty wardrobe staple, look no further than Amazon's vast selection of women's flannel shirts. With a range of styles, colors, fits and silhouettes, the perfect fall flannel shirts are waiting for you . . . so what are you waiting for? From classic plaid to edgy new designs, shop our 20 favorite Amazon flannel shirts below - starting as low as $10. 20 Fall-Ready Flannel Shirts We're Buying ASAP 1.