To wear this T - shirt, simply put it on like any other shirt. It's suitable for various casual activities such as hanging out with friends or going for a walk. When it comes to maintenance, you can machine - wash it in cold water to keep the colors and stripes looking fresh. Use a gentle detergent and avoid using bleach as it may damage the cotton material. After washing, tumble dry on low or hang it to dry. Regarding sizing, always check the size chart provided because different suppliers may have slightly different measurements. Make sure to choose the size that will give you a comfortable fit.