Did he just come to you like that, or did you have the uber-pickpocket perk that lets you take equipped items (read: clothes)?
I've just found that my sneak doesn't work so well anymore, and my assassination with a single dagger strike doesn't guarantee the kill-cam as much anymore. I was wondering if they nerfed the sneak skills in the some sort of update, since Steam was downloading it.. but it's probably because the NPCs have been scaling up while I've been putting perks into lock-picking now to get the unbreakable perk.
Meanwhile, I've got 130+ lockpicks to burn.