Could he? Would he? If not the Tiara, why not it’s predecessor? Why not? He did bring back the older style Pallium. The Camelaucum: The pontifical mitre is of Roman origin: it is derived from a non-liturgical head-covering distinctive of the pope, the camelaucum, to which also the tiara is to be traced. The camelaucum was worn as early as the beginning of the eighth century, as is shown by tho biography of Pope Constantine I (708- 815) in the “Liber Pontificalis”. The same headcovering is also mentioned in the so-called “Donation of Constantine”. The Ninth Ordo states that the camelaucum was made of white stuff and shaped like a helmet. The coins of Sergius III (904-11) and of Benedict VII (974-83), on which St. Peter is portrayed wearing a camelaucum, give the cap the form of a cone, the original shape of the mitre.

A Russian Orthodox priest I met said, “But why has given up the crown? Our bishops wear crowns, why has the Pope of old Rome stopped? Does he think our bishops should stop?”
Agreed, I don’t know why he did it. Not good for ecumenism. Same thing with giving up the Papal title “Patriarch of the West”. The Orthodox totally agreed with that, but they dropped it.
Whoa! That’s what my Pope Innocent III action figure is wearing!
http://romansacristan.blogspot.com/2006/10/winner-is-me.html
[...] Kind of Looks like the Cameleaucum here [...]
The Pope is not a Patriarch, IS THE POPE! And because he is the Pope, he is not the Patriarch of the West, but the POPE of ALL christendom. It’s very simple, and that’s why the Orthodox liked it, because it was like a “limit” to the Primacy of Peter. Simple Catholic Wisdom, he he.