[mpregisamazing]

I'm a bigger dude, and I'm not really sure how to simulate without it looking like just my normal big belly.

[Animekistune]

You can try to use pillows and shape them to be round and pad with those. Make them like a big ball and try that. Can you post pics when u try?

[WolfgangD]

In my experience being a bit on the chunky side, one of the things that helps me is to focus the padding specifically on the belly so it looks disproportionately large and tight.