From my experience. I would just put snaps on the waistband. You could make it so that the waistband is slightly adjustable by putting a series of the male snaps on the inner apron an inch apart to allow for some adjustment in the waist.
Using the "KISS" method is probably the best and most efficient.
I would forgo a snap at the hip, let the aprons have some freedom of movement.
All the best with your project.