Give us some more information.
Take a look at a fat person's stomach, instead of sticking out, it sags out. So what helps with this is put heavy materials attached to pillows or w/e at the bottom of those fat to give sense of gravity. Therefore it looks more natural. though this sounds like it won't help much have u seen those breath drawn like a balloon? ya, gravity helps a lot. Try to make the suit consistent, so fat is little on top and goes heavier on bottom not sticking out half way. Some areas don't get fat as easily, (like ankle) look a reference of a sumo wrestler to see which area has the highest deposition of fat, and which area has the last.
