Ammianus and the Dura graffito translation error?

[daryush]

Yeah, that's right. The chest harness isn't really seen much in Western Asian armour after the early Sasanian era, but it still appears in Eastern Central Asia (Ushtrushana and Gandhara - and further east) even in the post Sasanian period. But it is absent from Sasanian and Sogdian armament and appears to be just worn by the Kings, eg: on hunting plates.