Then, I doubled that amount
First I folded along the "Center of Cuff" line and sewed the edges - right sides together.
Match raw edges of the cuff to raw edge of the sleeve (right sides together) and sew it on. Then I top stitch the seam allowances down to the sleeve. Ta-Da you're done!
I promise, I'll take pictures next time I do this, as this won't be my last thermal top - I love these for lounging and sleeping in.