@gemlog no, I don't think that there is a club or something about historical clothing in this area (there are some reenactment things, but they are focusing mostly on other aspects), but I believe that a number of people here on fedi do know about historical accuracy
and I don't care about having it, since I'm basically making clothing for day-to-day wear, but I think it's important to say what is accurate and what is not, for people who are reading this and may have reason to care
(and yes, the shirt does need something around the waist, be it a belt or being tucked in in a skirt)