Body Measurements are given in inches. If your body measurement is on the borderline between two sizes, go to the lower size for a tighter fit or the higher size for a looser fit.
If your body measurements for Chest and Height result in two different suggested sizes, you're better off going with the size from your Chest measurement.
Body Measurement Instructions
Chest: Start measurement from the side, keeping the tape horizontal. Wrap it around the body and hold it across the highest point of the chest.
Height: Measure from the crown to the floor, without shoes, feet together.