On Qing dynasty dragon robes, the Twelve Symbols of Imperial Authority make their first appearance during the reign of the Qianlong Emperor (1736-1795). Given that no other figure could wear this insignia, it is highly likely that this robe was made for Qianlong. When dressed in this robe, the emperor would become the center of the cosmos with the twelve symbols at his control. Twelve-symbol robes of this blue color were worn specifically during the annual sacrificial ceremonies for rain and a good harvest.
A Qianlong period gold-embroidered blue-ground dragon robe, lacking the the twelve symbols of Imperial authority, but with a very similar floral ground, is illustrated in Heavens' Embroidered Cloths: One Thousand Years of Chinese Textiles, Hong Kong Museum of Art, 1995, p. 218, no. 63.