And I just found another picture of a yoked ropa: page 110 of Moda a Firenze. It's Dono Doni's "Birth of the Virgin," and one of the attendants in the back is wearing one. The yoke is very short on the back shoulders, what we'd think of as shirt length rather than the longer one shown in Vecellio and Hunnisett.

I cannot find the painting online.