To Fit** Wearer's Chest/Bust: S-31", M-33", L-35", XL-37", XXL-39", 3XL-41", 4XL-43", 5XL-45". ** To Fit Size is the size of the wearer's body without any layering.
Other details
The amount of ease provided in the jacket/coat depends on it's perceived usability, e.g. if it is a light weight jacket without any polywadding the ease provided would be less, as compared to a jacket meant for extreme winters, assuming the layers worn underneath shall be more.