We classify this jersey as "Pro Fit". They are built to sit near your skin but allow a little more breathing room than "Race Fit" jerseys (ie. FR-C, EXO, NX-G). If you prefer a loose fitting jersey, you should order 1 size larger than the size chart recommends.
Measuring: To accurately measure your chest, measure across the fullest part of the chest just under your arm pits.
This chart is intended to be used only as a guideline. Cycling Clothing is designed to fit differently to capitalize on specific fabric properties and features. Your size will vary based on your personal preference.