It's not exactly for armor-related purposes, but I think it's actually part of the uniform dress collar, so maybe I'd be able to get away with just referring to it as a collar, anyway. ^_^;
Yeah, that might be the simplest way to do it maybe. It IS close enough.
Chokers are meant to be fitted tight against the neck (hence the name), as far as I know.
Mmm, but with nothing being a perfect word for it, well, a "loose fitting, tall choker" should at least describe it well enough that you understand the explanation.
And this is where Wikipedia was confusing me, saying that nodowa=gorget, and only showing mostly front-of-neck examples of gorgets. :/
There ARE gorgets that are only front/side covering. Also, part of why i suggested choker is due to how most normal models of all of those variants is because of how much they continue down/outwards from at the low end of the neck.
So, since it´s not "armour", and i presume it does not extend outwards/downwards much, a collar or choker might be the best name for it. Next best is probably guruwa, then gorget. I think... Definitely not clearcut.