Some years ago I refashioned a turtleneck pullover (no before picture) by removing the turtleneck, and edging the neckline with biastape.
But it was not quite right.
So I refashioned it into a cardigan. Better, but the ribbing at the bottom of the pullover/cardigan was pulling in a way I didn't like. Also, the neck opening had become a bit too wide.
So, now I have refashioned it again.
I removed the ribbing and added it to the neckline ((blog post here). And hemmed the raw edge.
I like my new cropped cardigan very much and the neckline is so comfortable.