Please note that the plume fastener for this lot is not jadeite, and is either dyed quartz or glass.
Peacock plume and case: G. Dickinson and L. Wrigglesworth, Imperial Wardrobe, Berkeley and Toronto, rev. ed., 2000, p. 112, pl. 94.
Peacock plume and case: Fitchburg, Massachusetts, Fitchburg Museum of Art, Costumes from the Forbidden City, May 1989.