I can only think of two YT members at the minute who make and sell belly bands... I'm sure there are others but these are just off the top of my head.
One is Linda (FuFuFashions) and her site is
http://www.fufufashions.com/
The other is Kim (Litlbitranch) and her site is
http://www.PuppyWraps.com I believe.
Hopefully one of these two will have a fabric you like and they can help you.
