Most flannel shirts are fine until you wash them twice. The fabric goes limp, the buttons start looking sad, and what felt like a considered purchase starts feeling like a mistake. We’ve spent enough time with bad flannel to know exactly what separates a shirt worth owning from one that just photographs well. Weight matters most. A properly brushed flannel has a density to it that you notice the moment you pick it up, and that same density is what keeps it looking structured after a year of regular wear. The pattern should be woven in, not printed on. The collar should sit well open, because that’s how you’re going to wear it. We’ve been looking specifically at shirts that work just as hard tucked into trousers as they do thrown over a henley on a cold weekend. These are not novelty pieces. They’re the kind of flannel shirts that earn a permanent spot in the rotation and stay there.