I am horrified. It is disgusting.
Here is one way to check:
The Burn Test
The best test is the burn test. In general, natural fibers burn and synthetic fibers melt. You probably won’t be able to do this test in a store, but if you buy an item or if you already have an item you’re unsure of, cut or pluck a few hairs off of the garment. Using a lighter or a match, try to burn the ends of the hairs. If the tip of the hair burns, crumbles away when you touch it and smells like human hair burning, it is real fur. If the tip of the hair melts, curls up into a hard ball and smells like an unnatural chemical, the fur is synthetic.
Courtesy Animal Rights
But I would just part the fur and look for the pelt because one might be arrested for burning fur in a store…