If you wore the jacket in a dream, then such dream indicates the concept you are trying to create. Perhaps you really care the way you look and what others thing about your image. On the other hand, the dream could show how you are sheltering yourself from the outside world. Maybe you do not want to show some aspects of your personality or trying to create completely different view about who you are. The better explanation of the dream could be interpreted if the color and style of the jacket was known.