Bust: 
Measure the fullest part of your bust. Don't follow your bra size. Follow circumference of your whole bust - all the way around. Sizes correspond to your bust or Belly whichever is bigger.
 

                                                                  Size                         -          Chest in Inches
                                                                  ---------------------------------------------
                                                                                            
                                                                   2XS                         l                            32  
                                                                   XS                           l                            34 
                                                                   S                             l                            36
                                                                   M                             l                            38  
                                                                   L                              l                            40  
                                                                   XL                            l                            42 
                                                                   2XL                          l                            44
                                                                   3XL                          l                            46 
                                                                   4XL                          l                            48 
                                                                   5XL                          l                            50