Larger question: Is one allowed to derive benefit from a dead body?
A couple of qualifiers:
- obviously if there would be zilzul to the dead body in any form of course the answer would be no
- medical students operating on a cadaver doesn't seem to really be "hana'ah" so doesn't seem like a strong proof
The example that came to mind would be a sheitel.
Would one be allowed to wear a sheitel that was taken from the hair of a human corpse?