And another sample...

The jacket is originally for Posette. It needed a slight increase in the overall yScale for the collar to show, and a reduction of breast size on Furrette. There's also a poke-through problem at the back of the arms.

P5 materials from Mapps.

Anyway, comparing the grouping, Victoria (all versions) and Judy have much larger collar groups, which encompass the breasts. Some poses, that doesn't make much difference.

As for the arms, I suspect there to be a difference in the position of the bones relative to the mesh. It's the sort of thing that you can tweak in P5, but it can be a lot of fiddling.