If I had time I'd download and check this out myself, but I don't.

I often see freebies with inconsistent UV mapping scale, which could be the problem here. It would help to understand the UV density better. Could you make a simple checkerboard texture image and apply it and render so we can see if there is a UV scale inconsistency?

If there is, you have two choices - remap the props or abandon UV based patterns altogether and go with procedurals driven by model coordinates or world coordinates. Model/world coordinate based patterns can be applied without much difficulty, but I generally find it better to start with good UV coordinates. For cloth type materials, its easier to work with UV coordinates, even if you intend to use a procedural pattern generator, such as my Loom.

Once we understand what we're dealing with, then it will be easier to suggest how to proceed.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)