HOW TO CALCULATE CHEST SIZE:
Width of your Chest plus Width of your Back plus 4 to 6 inches to account for space for a loose fit.
Example: 18″ wide chest plus 18″ wide back plus 4″ of space, would be a size 40″.
Be sure to compare your measurements with a jersey that already fits you.
Please consider ordering a larger size, if you prefer a loose fitting jersey.