No, there is more. You see that light brown/sand-coloured stuff with the cracks in it (it's lighter than the jacket itself)? That's the dirt texture. It's present in the screens of the other versions too just way more transparent.
EDIT: I'm also pretty sure that that's a jacket made of fabric, not leather. That's probably what caused your confusion - you thought the cracked mud was a leather texture.
Ah yes, I can see it's not leather now, more of a canvas material that is very dirty.
It's the white details that are most prominent on the shoulder area and on the edges of all folds which I are referring to.
Having a look around online , whenever I see her with a clean face she has a very new looking jacket, so what you says makes a lot of sense.