Okay, so I've seen this before, but only took real notice of it today with a girl I was gaming. We're standing, facing each other and talking. It's cold in the hallway we're in (and, later, outside) so she has her arms crossed. Usually I'd pay attention to the upper body for my BL IOIs, but she was naturally closed off because of the temperature, so I focused elsewhere.

I noticed that there was a bit of hip rocking, but the thing that got my attention, and I didn't know what to do with it, was her crossing her legs.

As we're standing she would swing one leg in front of the other and cross her feet at the ankles, stand like that for a few moments (anywhere from 3-15 seconds) and then return to a general standing position.

What does this mean as far as body language goes? Is it a way of closing off, or is it an IOI along the lines of the hip rock?

_________________
If the dream is won
Though everything is lost
We will pay the price,
But we will not count the cost.
-Rush

I think you are trying to read into something that was no there. You said it was cold and the body language you described seem to fall into a person being cold.