To dream that you are in mourning refers to your inability to let go of the past. You need to clear those old experiences and make way for the new. Alternatively, the dream may mean the contrary and shows how you are able to let go of the past and accept the loss.
To see others or dream that you are wearing mourning symbolises grief, bad luck, and unhappiness. Alternatively, the dream signifies a disturbing influence or some misunderstanding within your social circle.