>>6657297I did the leather
>>6657548 anon mentioned (pic related) and "how to" (Not sure if it's instructive enough but well up to you to decide) is in the post in
>>6637377 but basically is citadel skrag brown (and the vallejo model color I can't remember) acrylic as a base color and then with oils do highlights and shading and then the slightly worn out look.
But the cheap leather (was it leather what they used? I think it was some cheap shit) under much heavy use would worn out definitely, probably towards light colors so just google "worn out leather" and see what you're after. As for "how to" the harder step is finding the colors, then you have several ways to achieve the same from dry brushing to blending to airbrushed to pigments or a combination of them.