No way. I know players were concerned about being spied on in the Armory when it first came out, but are you guys really putting on a logout set before you exit the game? This guy's a shadow priest, but he doesn't have any arena ratings that I can see, and he's Exalted with the AV faction (not that hard), and only Honored with the other two, so who is he hiding his gear from? Does he not want Magtheridon scouring the Armory to see who's coming to get him this weekend?
Seriously, do you guys really do this? Is it that important to hide your gear that you have to carry around a completely separate set to put on every time you log out? And even if you do, can't people see your set while you're wearing it? All they'd have to do, I'd think, is wait for you to log on, and then check the Amory to see what you were wearing (or heck, just go find you in game). Do any of you really use "logout clothes"? And for the love of Thrall, why?