Looking through the tag there are cases of posts that are not dresses (post #2251868, post #1936657), suspender_skirts (post #1681684), and posts that probably should be cleared up if they're dresses or skirts (post #2158527).
For the first two, if the jumper is a dress they need to be cleaned from the tag. For the last one, we need to define at what point it is a dress and what point it is a skirt.