>>84702421. Plaid skirts are synonymous with Catholic school girls.
2. Those are either knee socks that are too large for her or thigh high socks. I assumed knee because they just barely make it above her knee while proper thigh highs tend to go a bit higher.
3. Thats literally what it fucking is you absolute moron. Google "high waisted skirt" and you'll get images of exactly that kind of thing.
Regardless of if I'm using nomenclature you approve of, it doesn't change the fact that her get up is specifically designed to project an imaged of sexualized youth. And you know this entire fucking thing was carefully set up and planned before hand so she could have the right outfit, carefully combed hair, someone taking a photo, etc.