In Japan, panty line is commonly refered to as PANTI LYNE.
In the North Pole Panty Line is rarely seen, because people wear a lot of clothes. You are more likely to see it's cousin, red scarf.
Red scarves are often worn in bitter cold climates and some natives find them a real turn on. The nice thing about red scarves is that you wear them on the outside of your coat. For this reason, they're much easier to detect.