To wear this men's long - sleeve shirt, simply put it on like any other shirt. Button it up starting from the bottom. When choosing a size, remember to check the size chart as each item has its own specific measurements. For example, if you're used to US sizes, you may need to adjust for Asian sizes. As for maintenance, you can machine - wash it in cold water with like colors to keep the floral prints looking vibrant. Hang it to dry to prevent shrinking. Avoid using harsh detergents as they can damage the polyester and spandex material. If there are any wrinkles, you can use a low - heat iron to smooth them out.