[Sca-cooks] tablecloth, shroud or food cover?

[Suey]

Can't find the message but someone said yesterday there is a 6th C 
painting of the Last Supper with a tablecloth. Now I find this 
confusing. Is this a symbolic reference to the Shroud of Turin? I do 
find some Jewish references to a leather tablecloth and to clothes 
covering food to keep the flies away but not to linen table coverings. 
Does anyone have more data on the history of the tablecloth?
Suey