A quick first study for my intended collar rerig. Took phantom3d's original Antonia WM, transferred to lo-res, moved the right collar origin to the actual origin of the collar bone, aligned the twist direction with the direction of the bone, and did some very quick-and-dirty tweaking of the up-down weight map, just around the collar bone itself and the lower neck. The left collar is unchanged.

Antonia is trying to raise her arms with just the collar joints here, no shoulder involvement. Identical settings for both sides. I should add that twist, up-down and back-front are all used, but I've only edited the weight maps for up-down.

-- I'm not mad at you, just Westphalian.