[bornacatholic]

I believe this Gospel passage is also the basis for the custom in the old (Tridentine) liturgy whereby the server/deacon holds and slightly elevates the end of the celebrant's chasuble at the elevation of the Host and the Chalice.

*I think that action harkens back to earlier times when the size of the Chausable made it necessary. The Chausable used to be a lot larger and heavier.

[Theophane]

Could well be. I did read the "touching the garmnent" theory in a book once, but it could have been erroneous, anyway; I think the book was not a Catholic book per se but was more generic in its approach to liturgical rites as ceremonies.