The drastic change in clothing style during the Qing dynasty is mostly attributed to the Queue Order which forced Chinese men to adopt the Manchurian hair style and officials to wear Manchu clothing. This was one of the few Manchu customs that were imposed on the general population. However, it is notable that the Manchu did in term heavily adopt Chinese customs and become sinicized to the point where the Manchu language is in danger of extinction. This will be the last imperial dynasty.
More pictures below the cut.