The sweater you are wearing is seen as the omen of comfort. The dreamer could also be looking for security and shelter and the sweater is the symbol of it. It protects you from the badness and scary situations you might get yourself into. To get more detailed dream interpretation, please also see the meaning of different colors or structures of the sweater.
Dream dictionary: Sweater dream meanings
To dream of the sweater that you see or wear, shows the strong bond you have with your family and other relatives. The dream could also mean that you are looking for the affection. If you were knitting the sweater, then it denotes to your imagination. On the negative aspect of the dream, it would show the lack of endurance.