Hm. The problem is that the vertical ropes on her chest are supposed to go between the cleavage, and as such need to be hidden behind the right breast. But at the same time, the torso costume layers, with the exception of the left breast, are all above the skin layers. Hence the masking tricks, since there's no right breast costume layer to hide the cleavage portions of the chest costume layer. It should, in principle, be possible to implement a check that applies the masking tricks if no visible right breast costume layers are detected, and disables the mask if there are. But I'm not sure if that information is visible to a vanilla mod. That is to say, when costumeModA and costumeModB are both loaded, can costumeModA determine whether or not costumeModB added any sprites to her.torso.topContainer.breastTop?