I am not a tiny person, but I am not xxxl either. This doesn't adjust small enough for me except in the smallest setting, which means if I lose ANY weight it will no longer fit at all. The zipper sizing adjustment is a neat concept but it is actually difficult to get sized to your body, especially if you're not busting at the seams, because the gap between them is several inches. It is misleading because the person in the sample picture looks skinnier than I am and yet it fits her just fine.