questions about cavalry shoulder doublings

[Marcus Julius]

This probably should have been different threads, but I have some questions about shoulder doubling for cavalry armor.

The first is about the ornate plate pieces.
Every image caption or reference to them, says that they were worn over a Hamata cuirass. The question I have on these is, are there any statuary or other evidence showing what the rest of the shoulder looked like? Would this have been attached to more plates, like a seggy shoulder? additional segmented lames to protect the outer shoulder and/or upper arm(since Hamata and Squamata doublings that I've seen for cavalry extend outward further than for infrantry to protect the outer shoulder/upper arms more)?
Or, would these have been more of a single solid piece such as those depicted on statues attached to the muscle cuirass style breastplates?

Second subject is on Squamata - Most of what I've seen on Squamata, both recreations, and statues, show the shoulder doubling to be solid across the chest. Could someone enlighten me as to how this would be 1) attached to the shirt, 2) be able to fit a head through and yet close in around the neck as they all appear to be?


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