In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Belt
To wear a belt means that you will pass through a period full of pressure and problems. If you loosen a belt, then some of your problems will be resolved and you will feel relief.