The manner in which a jacket fits on the shoulder is critical because it proportionally balances the way the rest of jacket looks. The seams need to align at the spot the shoulder connects to the arm. The jacket model must have the appropriate design.
If a person has a full chest, it is better to choose a garment which offers the fuller chest fit. In suits for men, the model is an athletic cut where the chest area is ampler. There are many styles today that satisfy all shapes and sizes.