It does make me wonder if Tataru's smile was actually based off of a smile or a smirk emote though. Either way, it seemed to me that there was a lot of emphasis put on that scene and her "goodbye" there, as well as some comments that other npcs have made about her as has been mentioned already. I mean for instance, from a design standpoint, why waste even as much as a text box or two to emphasize in that npc's script that Tataru shouldn't even be capable of getting the mats for that outfit if there's no real reason for that information to be revealed to us?