Attention:All of our shirts are Asian size,it is smaller than Europe or US size, it is different with your country size, please make notice of this, if you are not sure about the size, you can tell us your height and weight, we will check our size for you.
Also you can take one of your before old shirts, and measure the chest,sleeves,waist,shoulder, like attached picture, so that can compare with our size chart, then choose the right size.
( The attached picture is one of my customer send to us, just for your reference.)