Is the custom of wearing distinctive clothes for one afflicted with the death of a relative, so that people may recognize him and offer condolences, permissible or not?

There is no harm in the family of the deceased standing in rows at the graveyard to facilitate receiving condolences. However, it is disliked for them to wear clothes that distinguish them from others, because that might indicate impatience and excessive grief. The predecessors did not do this, and it contradicts patience.