《礼记·丧服小记》
父亲生前的爵位是士，而儿子却当了天子或诸侯，那就可以用天子或诸侯的祭礼祭祀父亲，但尸还是穿士的服饰。
父为士，子为天子诸侯，则祭以天子诸侯，其尸服以士服。
If the father's title is a scholar before his death, but his son has become an emperor or a prince, then the father can be worshipped with the sacrificial rites of the emperor or the prince, but the corpse is still dressed in the scholar's clothes.