It's not just the Nadin armor items - There are a bunch of things that were bind on equip (or not bind at all) when placed in house storage that are now bind on aquire (while in house storage) after the update. Numerous random drop armor items as well as various cosmetic items were affected by this update.
When I come across good looking armour items that are bind on equip, I place them in my house storage so that I can share the cosmetic appearance with other toons through their shared wardrobe system. It is incredibly frustrating to find that items that were collected over years of gameplay are now stuck in somebody else's inventory because Turbine changed the binding status of the items without any type of warning to the player.
Guild-Maxed Westemnet(T10) Metalsmith, (T10) Prospector, (T10) Tailor
Power-Leveling Newbies Since Update 7! ...Now with Multi-Boxing!!! :D