You know what? I will take it off...

You slip your cardigan off, sighing as you feel a bit of heat escape your shoulders and arms, and place it over the back of your chair. You still feel warm, but you definitely feel much better without your cardigan on. You tense up a bit when you see Mr. Doe glancing in your direction, but you are relieved when he just continues on with his lesson.

Looking down at your notebook, you notice that you have not written anything down yet. Of course, you don't need to, but you feel slightly guilty for just sitting there doing nothing. You look up at the board and notice that he has written completed problems up on there. He probably wrote it on there when you were not paying attention.

You turn to the clock in the classroom and see that there is still half an hour or so of class time left. You could copy down what he wrote if you really felt like it, or find something else to occupy your time with.