Socks to be You

This morning, I saw a school girl on the train glue her tall socks to her legs with a glue stick to keep them up. I wonder if that's common practice. They do seem concerned with keeping their socks pulled up as high as they'll go; they stop constantly and abruptly to stand on one foot and tug on them. Maybe it's a winter thing. It's balls cold and they're not allowed to wear pants.