Chosen Solution

I have an old and much loved bear. He’s going bald in patches. I know I could replace that bit of fur but ideally I would like to add back fluffy fur onto the existing fabric, to protect it. I don’t mind how long it takes. I have found a source of wool fleece to use. Is it possible?

You could sew on the wool fleece to the bald patches, or customize it like by adding bits and pieces of patches to the bear like a hobo-ish theme. You could also cover up the patches with clothes, like a hat or overalls, build-a-bear sells a lot of stuffed bear clothes.