I would cut across on chest line, to make the increase in length to go over the belly. Redraw CF line which also gives you an increase in width at the waist and an increase in width at the hem.
To reduce some of the excess at the hem, you could cut along the bib line shoulder to the the circled area, cut up from the hem to the curcled area but not through. overlap at the pattern at the hem. This opens up the pattern along the bib seam. (transferring a dart) Now you have a dart pointing to the belly from the shoulder.
The bib needs to come to the waist. if it is shorter, then you are removing some of the needed waist width for corpulence.
You may still need to adjust the side seams too, in order to make a large enough increase at the waist.
You will also have some gain for gathers or pleating below the bib at CF.