"Two actually, one of which if we get caught could be lethal and jeopardize the mission, the other much safer but less to your liking. I'd assume anyways," he said, and began to explain, "If you really want to keep your robes, we could pose as religious workers, or temple guards, but that requires either great knowledge of religion or extreme quantities of luck."
Here he paused, because he didn't want to propose something that he knew she'd bite his head off for, but every opportunity was one worth at least thinking about exploiting.
"We could..." he said hesitantly, "Go down the path I normally choose, wherein I feign being a trader. That way you could wear sufficiently concealing clothing, and you could let your tail fly, but you'd have to act the part of a particular kind of slave. Otherwise it's sackcloth and shackles, but certain slaves are treated very well, and as such, you could do some snooping without much hindrance."