Smart-casual dressing is all about timeless pieces that blur the line between formal and informal. With this quarter-zip sweater by Polo Ralph Lauren, you can wear it with tailored pants and a collared shirt to shy away from making a formal statement while still looking smart. Alternatively, throw it on over sweatpants and a T-shirt and your casual ensemble will seem instantly more polished. Cotton/Viscose/Nylon. Colour: natural