Leather duobler for hamata

[jbd_29349]

I have seen several illustraions of soldiers wear hamatas that have, what looks like, a leather doubler. The most recent has been a picture from an up coming book in the recent Ancient Warfare magazine.

Is this a thin leather cover over the hamata doubler or a thick leather doubler for the hamata?

What evidence is there of this leather doubler?

How common was it for soldiers to have this?

[GiacomoAquilus]

I was about to make a post about it myself, kinda curious about it

[Dan Howard]

There is no evidence at all. We don't even know whether the edging is made from leather.

[Nathan Ross]

I've seen this a few times in illustrations (like this one by Jonny Shumate). They always seem to have a caduceus or 'rod of asclepius' emblem on them, so I assume that whatever source they're drawing on must show something similar.

One possibility might be the Altar of Domitius Ahenobarbus. It's hard to make out whether this is supposed to be some kind of painted vine/serpent symbol on the shoulder, or just an attempt to represent mail, but it does look a bit different to the rest of the armour: