Hell i would argue if you basically made the equivalent of a ball joint figurine with foam filling all over you could even make actual clothing pieces that struggle to fit into the frame, maybe having areas behind certain patches to cover up entry holes that could be used to pump more filling into those parts
This would basically be the equivalent of a barbie, as disgusting and creepy as it sounds, it could actually sell and by bought by a lot of people who are into fatties, hell you could then even make them out of actual fictional characters too.
I think i actually came up with a cool marketable concept. Foam Filling Figurines that look like obese fatties you can costumize