This series of photos from the blog of Matthieu Ricard shows the late Trulshik Rinpoche wearing the ceremonial hats of each of the four main schools of Tibetan Buddhism. From left to right: Gelugpa, Sakya, Kagyu and Nyingma:

Ricard states:

“Kyabje Trulshik Rinpoche was chiefly a master of the Nyingma tradition of Tibetan Buddhism but, like Dilgo Khyentse Rinpoche, he was a perfect example of a non-sectarian teacher… These images were taken during the transmission of the Treasury of Precious Instructions (Dam-gnak Dzö), at Shechen monastery, in 2003.”