Sandor7, it's too tight because you've got the over apron pulled clear across the entire "last" pleat on your right side. The right hand edge of the over-apron is completely covering the pleat. NOT!

Reposition the buttons so that the right-hand edge of the over apron lines up with the left hand edge, or the forward-facing edge of the "last" pleat on your right side. That will give you easily another 2- 2 1/2 inches of space and the thing will fit.