You need to add the total desired ease.
The program does not increase the ease because it is a jacket.
The amount of ease depends on the desired fit and what you plan to wear it over.
A good way to determine ease is to measure a current jacket you own and subtract your circumference from that number.
For instance if you have a jacket you like and the hip measures 44 and your hip measures 40 you would want 4 inches of ease.