I hope that I don’t sound like a precious Catholic obsessed with liturgical garb, but I can’t help but pointing out that the Holy Father is wearing a pontifical dalmatic under his chasuble. Old school…

This symbolizes that the Pope as a bishop possesses the fullness of Holy Orders. He is a deacon, symbolized by the dalmatic. He is a priest, symbolized by the chasuble. He is a bishop, symbolized by the mitre.