Most of the time material editor files have no idea what material collections they are gonna apply to. However, most merchants use 'em to include advanced shaders while leaving the MAT pose with a basic texture.

Love it/hate it, once you have P5+, always look to the material room for texturing.

(Oh, and that's an interesting find about the eyelashes.)

In This Twilight- My FIRST public poser work in 2 years!
Also the reason why I endorse postwork (:D)