I actually don't know by head if I used an asset downloaded (trunk), or if it's homemade (I did a few).
Regarding wrinkles; yes, that is something I have to add more. I do use some texture to add random wrinkles, but maybe too subtly. Getting good wrinkles in geometry is far more work, and I often don't have time to make my models so highpoly and detailed. And this was a hurry-job, as the finished render had to be redone with different clothing for all 4 soldiers in 1 day, and the render alone took 25 hours, so the adjusted crops did quite some time too. But I certainly get your point.