Heavy Coat With Shorts, WHY?

I was out running errands today here in Topeka. It was about 27°. I saw a BUNCH of people wearing a medium to heavy weight coat with summer weight shorts. Only about half of them were rather large. I don’t get it. If it’s cold enough to wear a medium to heavy coat, why wear shorts???? I just don’t get it!
No kidding, I'd rather have my arms be cold then, well, you know