Cant see it with your coat on... ![Wink ;)](https://www.iceshanty.com/ice_fishing/Smileys/default/wink.gif)
You are exactly right. Usually anybody in Minnesota fishing in a sweatshirt is either frozen solid or inside a shelter (where nobody can see it anyways).
I think what is needed is a florescent vest thing that one could put on over a large parka.