Chest:
With arms relaxed at sides, measure directly under your arms around the fullest part of your chest and shoulder blades, keeping tape parallel to floor. Shirt sizes correspond to your Chest or Belly whichever is bigger.

                                                                                    Size in Inches
                                                                  -------------------------------------------------------                         
                                                                   S                             l                            40 
                                                                   M                            l                             42 
                                                                   L                            1                            44 
                                                                   XL                           l                            48
                                                                   2XL                         l                            50 
                                                                   3XL                         l                            54 
                                                                   4XL                         l                            56
                                                                   5XL                         l                            60
                                                                   6XL                         l                            64