These are the coat cuffs. Just realised that the felt piece will be folded double and it would be too thick.
Have fixed this by cutting off just less than half (half + seam allowance), then making a matching piece in the cotton. Stitched them together and the bottom piece is one the finnished new cuff pieces. It has the same shape and size as the original piece but will not be so bulky. The stitching line between the two is on the line where the cuff folds.