Wearing a Coat

I was doing bus today today after school outside. What that means is that I stand outside and make sure the students get on the correct bus safely. It was about 40° outside today. I cannot tell you how many kids did not have a coat on! I asked them all where their jackets were and they all said that they were in their bags. Really? Everyone said they weren't cold. I'm not sure if this is a macho thing or if they think they are invincible or what. I'll be interested to see how many of them come in over the next few days feeling sick. I wonder what their parents say to them when they get home from school wearing only a short sleeve shirt. I don't get it. Kids need to wear their coats when it's cold out!