Responses

It’s from Celtic folklore! I didn’t describe it accurately earlier but the “coats” are actually the selkie’s seal skin, and wearing the skin lets the selkie shape-shift between human and seal form. Reading all kinds of folklore is really interesting because there so many stories that take inspiration from them.
I’ve been thinking ever since she first asked for the leather, that Ms. Miller is a selkie. Selkies are seals that can transform into women on land by taking off their coats. In story I know, a man could take a selkie’s coat to trap her on land