To wear this shirt, simply zip it up and adjust the zipper according to your preference. It's suitable for casual outings like hanging out with friends or running errands. When it comes to washing, use a gentle cycle in cold water to preserve the quality of the polyester and spandex blend. Avoid using harsh detergents as they may damage the fabric. After washing, let it air - dry instead of using a dryer to prevent shrinkage. Always check the size chart before purchasing to ensure you get the perfect fit, as different suppliers and brands may have variations in sizing.