Synthetic denim is everywhere right now and most of it is suffocating. Cotton denim breathes properly, softens with every wash, and has a quality you can feel the moment you handle it. That matters more in a dress than in jeans because you are wearing this all day, in heat, in movement, without the option of rolling up a sleeve when things get uncomfortable. Cotton denim dresses also last in a way that blended fabrics simply do not. The colour holds better. The structure recovers. After two years they look worn in rather than worn out, which is exactly what good denim should do. We have pulled together our favourite styles across shirt dress silhouettes, pinafores, and more fitted cuts because the category has genuine range if you know where to look. Some of these work with trainers on a Saturday. Others handle themselves perfectly well at a smart casual dinner. The best ones do both without any adjustment. We only chose pieces where the cotton weight felt right, not too stiff, not too thin. Denim this good is worth wearing properly.