Seeing something pure and lawful added to one's food or drink signifies provision that will be obtained easily. If what is added is not pure and lawful, the interpretation is the opposite. For an unmarried person, seeing another person's garment added to one's own signifies marriage.
Seeing another riding animal added to one's mount signifies elevation to a rank that will bring satisfaction and joy.
Seeing an additional room added to the rooms of one's house signifies blessing, ample provision, and benefit; it may also signify a spacious house.