It means something new has come, or everything has a new beginning. In the past, people used to wear new clothes on festivals, so the dream of buying clothes, which means family harmony and reunion, is a good sign, indicating family harmony.
Businessmen dream of buying clothes, are very sure of their own business, can accurately control the entry and exit of every sum of money, and have the opportunity to make big money. The patient dreamed of buying clothes, and his illness would soon leave him.