Breast Cancer Pillow

Hi gals! I’m trying to find a knitting pattern for a breast cancer pillow. They use the pillow to sleep w/to give their arm support and also to protect the area after surgery. I can find a pattern for sewing, but not for knitting. Has anyone ever done one of these? The pattern is in the shape of a heart. I’m thinking of knitting the front in an ubersoft yarn and then sewing it onto fleece. It has to be fiberfilled, so I don’t think I can make the front and back both knitted.