I find the following information from Fr. Hunwicke’s blog fascinating, particularly from an ecumenical perspective.
“Keen students of liturgical minutiae who haven’t read Anglicanorum coetibus may enjoy this recondite and tasty piece of information: some people think that an Ordinary is entitled to wear the Mitre and use the other pontificalia because he is an Ordinary. Not so. There is no provision whatsoever for that in the legislation erecting the Ordinariates. What is provided for is the granting of the ius pontificalium to those who previously were Anglican Bishops. In other words, Mgr Keith wears a mitre partly by virtue of his Consecration as Bishop of Richborough in the Church of England.
“Isn’t Pope Emeritus Benedict a gentleman?”