Arpenteur's clothing might look vintage, like it's been around since the golden age of workwear. But surprise - it's actually a modern brand, started in 2011 by two cousins who are all about that classic French workwear style. The Twin Overshirt is a mix of brushed cotton-yak wool flannel and nylon, with Primaloft® insulation for an extra layer of warmth. Mother of pearl buttons give this versatile shirt the perfect finishing touch.