This Heather Gray Nursing Top is super easy to use. Put it on just like any regular top. When it's time for nursing, you'll find it very convenient. As for sizing, it fits true to size, so you can choose based on your normal size. When you wash it, use cold water in the machine to keep its shape and color. After that, tumble dry on low to avoid any shrinkage. Also, don't worry about stretching it too much as it has a bit of spandex, but still handle it gently.