Epigonation

Embroidered palitza (photograph c. 1911 by Sergei Mikhailovich Prokudin-Gorskii).
Fresco of St Gregory the Illuminator wearing a gold epigonation (the half-visible rhombus behind the Omophorion) embroidered with an icon (14th century, Mistra).

The epigonation (Greek: ἐπιγονάτιον, literally meaning "over the knee"), or pálitsa (Russian: па́лица, "club"), is a vestment used in some Eastern Christian churches.