The most common thing pop media gets wrong about women's clothing
Elbows. For a very long time, women's elbows were essentially considered NSFW. So much that even naked breasts were more tolerable in public (as was the case with breastfeeding). For this reason, you can see every drawing of women from the medieval period to the early modern period with long sleeves. It wasn't until the Napoleonic period that female shoulders became SFW.
So, I'm personally annoyed when I see a popular depiction of the medieval period where all women either wear short sleeves or no sleeves. Essentially, those are prom dresses.
I'm not sure what the exact reason is for the taboo.