We have already allowed for the correct amount of sensory compression, so please use the exact chest measurement when deciding on size.
If your measurement is between two sizes, our recommendation is that you size down, although both will work. The reason we recommend sizing down, is that most individuals are craving the sensory input to feel calm, so slightly more snug is always a safe way to go. However, if the garment is for a growing child, you may want to choose the higher of the two sizes.
CalmWear needs to provide gentle sensory compression to the muscles to work effectively, so be sure to choose the size within these guidelines.