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1) That's not armor. It's lingerie. 2) It's quest reward of Gravesinger in Conall.

Or more properly http://aoc.is-better-than.tv/armory.php?q=skyshear

I know answer is probably no, but has anyone seen Hashima's hood anywhere else?

Seadog boots, pants and belt from Tortage tutorial (tutorial has silly amounts of exclusive item models). I think the shirt is sold in guildcity but I'm not sure.

That helmet is in Iron Tower.