Snuggies are "used" and not "worn" in their promotional materials, because it's better to be taxed as a blanket than a garment.

https://taxprof.typepad.com/taxprof_blog/2017/02/snuggies-ar...

Wonder if you could either sue them for delivering an insufficient product (it does not function as a slipper under the definition for longer than a day after walking) or keep returning them under warranty.