Take one grey cardi and a T shirt.
Cut the front off the cardi and stitch it to the back.
Now it has tails.
Cut the T shirt into strips and sew around the edge of the cardi.
I liked the wrong side of the fabric and edge rolled back nicely.
I added detail with felt circles, fabric and buttons.
I cut the cuff off the cardi mainly because my arms are never that long and added some interest with felt.
You can never have too many cardis in winter.