Filson's 'Deer Island' overshirt is the kind of piece you can rely on year-round, as it'll keep the chill off when it's cold and can be worn in place of a jacket in milder weather. It's made from brushed cotton-twill that's soft, warm and substantial in weight - 9.7oz to be precise - and has military-grade buttons to enhance the robustness. The chest pockets are big enough to stow your daily essentials, while the on-seam ones will keep your hands toasty.
