I think it would be easy to make one. Just buy the hoody, and a matching pillow case, fold the later in half with the open end towards the neck of the hoody pen and sew in place around the 3 sides leaving the top open. You know have a faux cat hoody! You would probably do it with a nice bit of fur fabric or anything your moggy likes.
I think it would be excellent for zoologists who are baby sitting small animals like kangaroos, also for those having to carry a puppy around when outside before the pup has had it's vaccinations.