This is an interesting bit of trivia which I remember from my study of Ancient French at university. If you ever wondered how someone could have worn a shoe made of glass, well, the truth is, the shoe was made of fur.
An Ancient French word for fur was “vair” (variegated fur) which sounds the same as “verre” meaning glass. It makes more sense that Cinderella would wear a fur slipper than a glass slipper, wouldn’t it? But as the centuries went by the original description was replaced and the wrong description has been adopted.