How do you select the correct Size for yourself? 

Please don't rely solely on the label, as size can vary between products and brands. To choose the right size for yourself, you can either measure your chest with a measuring tape and select the size based on your chest measurement, as the length generally fits correctly. If you cannot measure, check the size chart of a product that fits you well, which you can find on the brand's website where you purchased it. Compare your chest measurement to the size chart below and select the size that matches your measurement, regardless of the size label. You should have no issues with the size.