It seems like there's a lot of conflicting information, some from video games or other wholly unreliable sources, and not much with a lot of background. All I know is that it was used in things like lamellar, holding to wood/metal lamellae, and was used as the structure for brigandine. And I've heard some ideas that it was probably used as boiled plates or coats on its own, but nothing definite. That's what I'd most like to know about.
hi! additional information is very welcome, but FYI there have been several questions on leather armour in this sub. Get started on these: