A slight problem: I took a look through some of the skirt_lift posts and noticed that many of them are actually wearing dresses and should be retagged to dress_lift. It wouldn't be right for those pictures to get the skirt tag.
Other than that, an implication seems alright to me. (Unless there's another liftable 'skirt-like' item I can't think of that is neither a dress nor the skirt, itself.)