+1.

I flew with a jacket where I was unsure whether it would be considered "light" or not. It could be considered either light or medium depending on whom you asked. I asked the TSA person running the BP scanner if my jacket would be considered light and she said that was a good question and if she were doing the screening she would consider it light which I took to mean that it was in the grey area between light and medium and someone else might have a different opinion and it is up to the screener to decide. I took my jacket off to avoid any potential issues.