I was thinking that about the platebody too at first, but then why are some using adamant and iron platebodies then, and why no legs at all? Almost like they're doing a lossy color match for the platebody. I assume they're capable of buying from quest-locked shops, ergo the dragon longswords.

I did see a number of them at KQ as well, but interestingly, far more running around in the kalphite tunnels themselves than at the queen.

Also a large presence at fishing guild and mining guild, as well as a surprisingly large presence at the mine under the grand tree.

The minimap feature on the viewer is neat.