Do you know the comment: put on your coat when you go outside otherwise you will catch a cold? We always wear a lot of clothes when it is cold so that our body is not stimulated and our circulation remains in a bad condition.
If Jane wants to go outside without a coat or just wants to go outside with 0 degrees barefoot, she can. You don't get sick from the cold, it strengthens your immune system. Getting sick from cold is in our adult mind. Children don't think like that, they enjoy it. It is good for the circulation. For short, active periods outside it is good not to put on too much clothing. You train your body and your mind with the help of the cold.
Unfortunately, our education system is not focused on happiness, health, strength or deep control over ourselves. That is why I am in favor of parenting as naturally as possible. As parents, teach your children to love nature, to be outdoors. Show how plants grow and teach them to love everything that lives. It is time to reconnect to Earth!