This is such a great idea! I'm definitely going to make some of these as soon as I come across some cheapo tights.
If you wanted to get even fancier, I'm wondering if you could sew a sturdy ring around the open end of the skins, something like a loose zip tie or maybe even the elastic from the waist band? (Similar to the ring around the Hennessy snake skins that makes it easier to pull over the fabric.)
Or maybe I'm just complicating things, I tend to do that sometimes. :}