SPANX® Poplin Oversized Button-Up Shirt, size XS, color Classic White/Timeless Navy. Worn once.The classic button-up just got a luxurious upgrade. Made from premium cotton with a super-fine yarn count, our poplin button-up shirt is lightweight yet durable, and perfect for every season. Plus, with an oversized fit and high-low shirttail for the perfect amount of coverage, it is effortlessly polished. Tucked or untucked, this machine washable button-up pairs perfectly with any of our pants for an instantly elevated look.