So our Mass goes back, without essential change, to the age when it first developed out of the oldest liturgy of all. It is still redolent of that liturgy, of the days when Cæsar ruled the world and thought he could stamp out the faith of Christ, when our fathers met together before dawn and sang a hymn to Christ as to a God. The final result of our enquiry is that, in spite of unsolved problems, in spite of later changes, there is not in Christendom another rite so venerable as ours. ~Fortescue
[If you want some kind of chronological order, work your way up when looking at the pictures = start with the last picture].
DE MANTO PAPALI
Summus Pontifex quoties ad thronum solemnibus functionibus assistit, vel Basilicam sancti Petri more nobili ingreditur ante missam pontificalem, seu in consistoriis, utitur manto papali, id est amplo pluviali caudato super albam cum cingulo et stola, necnon cum falda. Mantum papale eodem modo conficitur ac pluviale romanum, sed longe ducitur infra pedes, ita ut dum Papa ambulat sustineri debeat tum a parte anteriori tum a postica parte.
Mantum non sequitur codicem colorum liturgicorum sed vel est album vel rubrum.
In functionibus pænitentialibus seu in colore violaceo vel pro fidelibus defunctis Papa adhibet mantum rubrum cum stola violacea subtus. (Ius Pontificalium, 1956).
...And Paul VI was the last Pope to be seen wearing a Papal Mantum...
As Vatican II was coming to a close, Paul VI decided to wear a simpler form of the Papal Mantum...