Manchu semiformal collar, lingtou, for summer wear. Blue silk satin collar with a stiffened round top and elongated front and back. The textile is lined with blue cotton fabric. The closures consist of two knot and loop fasteners made from the satin cloth on the front. Under the round top section is an additional metal hook-and-eye fastener.
See Vollmer, John E., 2002. Ruling from the Dragon Throne: Costume of the Qing Dynasty (1644 - 1911). Berkeley/Toronton: Ten Speed Press. P. 61.