Abu Basir narrated from Imam Jafar ibn Muhammad Al-Sadiq عليه السلام that He said: "It is proper for the person responsible for the funeral (i.e., the chief mourner) not to wear an outer cloak (ridā') and to remain in a shirt (Qamis) so that they are recognized (as grieving). It is also proper for the neighbors to provide food on their behalf for three days.”