Okay. I've modified a garment model by adding a couple of matt zones so I can turn part of it off. The result looks rather like a collar, and I thought that a fur collar might look rather spiffy. However, the "collar" is, in fact, the inside of the garment, so the fur is on the underside rather than the top.
It's only one layer of "fabric", and with anything else any applied surface shows on both sides. But not with the fur shaders. Is there any way that this can be adjusted so the fur shows up on the outside? Just making the displace setting negative doesn't do it.