A "belly band" refers to a wide strip of fabric that is worn around the stomach area. It's often used as a support or compression garment during pregnancy or to help with lower back pain. Full definition
When I finally got maternity clothes around the end of my first trimester, it helped so much not to have anything feel tight (even with belly bands). (corporettemoms.com)
We need people who can follow simple sewing directions to make belly bands for some of our new arrivals. (poodleandpoochrescue.org)
The instructions give you all the information you need in order to make your very own belly band in any size and length. (craftstylish.com)