Hi, Mary B. About the size, you can find all the details about the sizes of each item by clicking the "size chart "/ "size guide" on every product page, including the guidance of measurement.
The size range of different products varies. The size letters vary between different regions and manufacturers.
Usually it will fit you well, if you take our size chart as the standard reference and choose a suitable size based on your measurement after measuring yourself, not the usual size you ordered. And please pay attention to the "please note" in description section on product page or in the "size guide". Any question, please leave a message here or contact our customer service via this link https://secure.livechatinc.com/licence/10095588/v2/open_chat.cgi?groups=2 We will do the best to help you.