It's very cold. What do boys mean by telling girls to put on more clothes?

It's cold, maybe a boy will ask a girl to wear more clothes. This situation should be understood from two aspects. One is that boys and girls have a good relationship, and they are just friends, that is, they have a good relationship. They may be good classmates at school or good partners at work. What the boys want to express is just to remind their good friends that the weather is getting cold. Another situation is that this boy wants to pursue this girl, and his meaning is not simple. He may want to say, I like you and am interested in you.