1.Invisible fasten off the piece being sewn on (Piece A).

2. Hold Piece A on top of Piece B, ensuring that the "right side" is visible . Thread a needle with the yarn tail from Piece A's invisible fasten off. Insert the needle into Piece B right below the point where the yarn tail exited. Pull it out of Piece B one stitch over, following the edge of Piece A. Remember to pull the yarn tight after each step.

3. Insert the needle from the bottom up under the top loops of Piece A, directly above the point where it came out of Piece B.

4. Now bring the needle over the top loops of the same stitch on Piece A and insert it back into the same hole it just came out of.

5. Pull it out of Piece B one stitch over, following the edge of Piece A.

6.Repeat steps 3-5 until all of Piece A is sewn onto Piece B. To finish, hide the yarn tail in the piece