Any chance you could share her pattern?If you are handy with a sewing machine or know someone who is, make some out of foam can coozies (sp?) my mother has made me several pair, the material is easy to come by and inexpensive, she puts full opening Velcro on it which you would appreciate if you had ever tried to stuff a duck foot into one that doesn’t open all the way.
This one could have been a bit smaller, it was made from the pekin pattern.