Making Roman Belts better

[Crispianus]

...we have been told that the belts need to be constructed using split leather sandwiched together, with stitching at both sides.

What is the evidence for this?

Would like to know what the evidence is as well?...... Barhill has a fragment described as a belt 3cm wide with a seam running center back with no edge stitching, but I've seen the same on Roman knife scabbards see Vindolanda...
The report references some finds from Vindonissa, but I've seen similar stitched pieces to those found at Vindonissa as reinforcing from tents from Valkenburg... a lot of strips with stitched edges can also be shoe reinforcing from the lasting margin on uppers ...

It may be an idea to check out surviving rivet lengths from Military belt plates in order to determine the thickness of the leather used if not the actual construction, assuming leather was used in the first place....

Split leather is a effectively a modern invention as far as I'm aware, this is different to leather that has been thinned out, as this was manually done by hand leaving no useful waste leather, the mechanical reduction is what produces splits...
Given the length of time it takes to tan leather in the old way it would make more sense to tan thinner leather such as bovine calf skin for this purpose as it takes much less time, and reserve the thicker skins for shoe sole leather...