The size charts and measurements are to help you find the right size. The sizes in the measurement charts are in accordance to your body measurements in centimeters.
Use a measuring tape on your body to determine the correct size. Choose tops according to chest measurements and pants according to waistline and seat measurements. Range of motion is already taken into consideration.
If your body measurement are between two sizes, go with the smaller size for a tighter fit and the larger size for a looser fit.