Why do children hate coats?

It's 35 degrees outside and a fine mist is falling. There is a toasty fire in the fireplace and my children would rather go outside. Not only would they rather be out there, I have to threaten them to get them to wear a coat!!! They're convinced the sweatshirt jacket they wear when the thermometer is at 60 degrees is good all year round.
I know their circulation is better, but it can't be THAT good.

The life of a mother.
Esther