Male college students wear autumn clothes inside and coats outside. Sometimes it's cold or not, they don't zip up their coats. Why do I feel someone is watching me?

It's okay. Maybe others look at you very well, or think you are dressed too thinly, and then, well, you have to be elegant and not enthusiastic, so others will look. Gee, do you want to know why you are dressed so thin? So maybe more people will, uh, see you, that's all.