I don't remember any full chainmail tunics in TW3, I think it was always just pieces of chainmail. From what I found:
It's pretty bad realism-wise as far as I can tell, but looks good until you focus on it.
BG3 for comparison:
Historically accurate:
Idk, the one in BG3 has very visibly stretched texture and the rings look messed up somehow. No idea how much it would take to make it look good.