I was looking through some pictures from the Mass of the Rings and I came across two very interesting pictures. It seems that the two "deacons" at the Mass were wearing red zuchettos and miters.
I am guessing that they were not deacons, but were serving as deacons. Who are they? I also don't recall this being allowed. Going to check the GIRM now.
Anyway, click here for the pictures.
Gives a new meaning to Cardinal-Deacon.
Update: I have checked this out and cardinal-deacons do wear the dalmatic at pontifical events. How did I miss this before?