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You can get upholstery foam at fabric store (JoAnn's around here). You buy it by the yard, so design what you think you'll want and calculate the yardage first. To shape it and keep it all in place (since you'll need to layer it), I'd probably wrap it in fabric and sew the fabric tightly to your "stomach", and come up with some sort of belt and/or suspenders system to keep it from slipping.
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