I saved the most important part and threw away the dirty, torn, shreds.
Old Blankie was sewn onto a new, clean, never been used burp cloth. After a slight hesitation new Blankie was accepted.
(P.S. Umm, don't every take your 4 year olds blankie and try and fix it. The first night he cried for almost an hour and wouldn't touch Blankie. I had to go through every blankie in the house and then make a makeshift one for him to sleep. The second night he said he wasn't going to cry but would not use Blankie. Blankie has now been permanently rejected. And I am so sorry I ever started this.)