Heed this suggestion: but one size up. If you normally wear a medium in America.mn sizes, then purchase a large. It will fit right. NOTE: the style of this shirt is intended to fit snug to your torso. If you fail to heed my suggestion, then you’ll look (& feel) like you’re wearing a size to small / too tight. Then wait until after you wash & dry. Great style, durable, ideal fit. And 1/2 price of typical Ralph Lauren or Banana Republiccomparable item