Islamic Interpretation of Dreams (Ibn-i Sirin):
(Heavy weight) If one sees himself unusually fat in a dream, it means increase in his wealth and richness.
Ifhe is wearing a yellow gown in the dream, then his dream represents a light sickness that will not last. Being fat in a dream represents respect, honor, strong religious convictions, being a special person, or it could mean fame.
(Also see Skin)