PRIVATE.
Essentially we're making magically-insulated fur coats, but I think we can workshop it to also generate some heat as needed. For practicality's sake putting on a layer is easier than the original application, anyway. And it's less liable to attract things with large teeth.
Option two: we collect existing coats and infuse. And I make a determination if I'm going to do this with you or notI did say I would recommend, not cast