I think the problem with rolling in under, folding etc, it’s due to the width and depth of collar. I’ve had a go and it doesn’t look right.
It is a lovely dress, and very warm and cosy. I would like to wear it more
I’ve seen a couple of videos on YouTube where people have altered a turtle neck by cutting and then using a crochet hook to refinish. I wouldn’t feel confident about doing that on this dress. I am pretty good at sewing, but haven’t knitted for many years. Might have a go on an old jumper.
Thanks for all the suggestions