Purity: Shrouding with Usurped Material
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 567:
It is not permitted to shroud a corpse with something that has been usurped even if nothing else can be procured; and in the event that the kafan of a corpse has been usurped and the owner does not consent, it must be removed from the corpse even if it has already been buried, except in a few cases – but space does not allow for the details of these cases to be mentioned here.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)