Just how late were these big mail drapes used in Western/Central Europe?

The Landesknechts used them, but the latest painting/etching/woodcut I've seen of one by them is a 1549 painting by Lucas Cranach the Younger:

https://commons.wikimedia.org/wiki/File:Lucas_Cranach_d.J._-_Die_Predigt_Johannes_des_T%C3%A4ufers_(Herzog_Anton_Ulrich-Museum).jpg

I've seen modern illustrations of light cavalry armed with pistols, helmets, and bishop's mantles supposedly representing late in the 16th or early 17th, but I don't know how historically accurate these illustrations are.

Any ideas or references?

Bishop's mantle mail? Do you mean the one worn by the person in red as in that Lucas Cranach painting?

Yes:

[ Linked Image ]

Anyone have evidence of them in use past 1550-ish from period paintings, woodcuts, etchings, or inventory lists?

I've got nothing, but didn't want you to feel ignored. :p

In fact, 1550 seems to be on the tail end of a fading fashion.