Placing items of a pious person or a piece of the Ka'bah cloth in one's kafan
Q: Some people, including pious people have some clothing of their pious elders (Buzrugs) placed in their kafan when they pass away for blessings or have themselves shrouded with the white cloth which is on the Kabah for blessings, is there any proof of this from the teachings of Nabi Muhammad (Sallalahu Alaihi Wasallam), the Sahaabah, etc. and is it permissible or bidah?
In the above situation, the clothing of the pious elders which is put in the kafan of the deceased for blessings, does it benefit the deceased in any way and is there any proof of this?