clothing advice for kids ice fishing

[Jim in CT]

taking my 12 year old
and 9 year old ice fishing for first time january 5. going with a guide who will have a heated tent. my 9 year old is sensitive to the cold, but he has decent ski clothes that are goretex. jacket and bibs and a good hat.

any clothing suggestions? he has waterproof boots he goes sledding in, but they aren’t great. should
i get him insulated boots, or just thick socks and foot warmers for his sled boots?

any suggestions, clothing or itherwise, would
be appreciated.

i can not wait for this...