This reminded me of something my daughter said when she was about 4. We have pretty much lived in the country all the kids lives, but were visiting the city one day. My daughter was staring at an attractive business woman walking towards us, head swivelling as she passed. My girl whispered to me "Mum, why does that woman have white arms and face and black legs??" Her face was incredulous. Of course, the woman was wearing sheer black stockings! Poor country bumpkin child!