Outter Mesh Color Projecting Onto Mesh Underneath

Hi again. All CAS items share the same uv space, meaning the garment and the body underneath it are using the same uv space and the same textures. If you look at your uv_0 map, you will see that the garment's uvs overlap with those of the body in the chest area.
Since the garment is symmetrical, the easiest way of dealing with it would be to just flip one half onto another and edit the diffuse, specular and normal maps
Or you can edit the body's uvs but that will affect the skin's and the bra's textures (well, not textures but how they are displayed)

- in UV editor enable sync;
- select a few faces on the left front side of the vest, Select - Linked to select the rest;
- disable sync to isolate it, select everything with A, UVs - Mirror - X axis;
- enable sync again, move this uv island on top of another one;
- do the same for the back;