So when a rig R15/R6 has a clothing on it, changing material of a part of the rig doesn’t do anything expect some materials.
Expected behavior
The thing that should happen is: When changing material of a part of the rig, it should get changed to whatever user has set it to.
Hey there, you can change the color in the data model under rig->Body Colors, as described in the body colors docs. If the part has a surface appearance - the underlying skin tone is visible only where the texture is transparent, as described in the overlay alpha mode section and custom skin tone.
Hope that helps.