This is believed to be a piece of Han Xiu embroidery from the area around Wu Han. Han Xiu differ from the famous four Chinese embroidery styles where the colour scheme are flat and without shades. Flourished in the early Qing Dynasty, this style has now become a dying trade as the artisans have disappeared during the war. This art has recently been listed as Intangible Cultural Heritage by the Chinese Government. This particular piece of embroidery is a remnant of the decorative piece of a duvet cover.
Wow, 3D !