Use slipstitch to seal ends
When finishing a closed garment's hem with a bias facing, you may find yourself a little lost at the intersecting bias strip ends. The basic rule is that one end of the bias strip should be folded in and overlap the second bias strip end layered underneath as shown above. Once you align and stitch the bias facing strip in this position, you may be asking yourself, what now? How can you get the folded layer to layer flat and flush against the other end of the bias strip underneath. This is where a simple hand-applied technique comes in:
To connect the ends of this bias strip together, slipstitch the folded edge to the layer underneath. To slipstitch, take a stitch through the folded edge then another stitch through 1-2 threads of the layer underneath. Repeat this stitching process until the bias strip is sealed.
Once the bias stripe needs are connected, the bias facing can be securely folded toward the wrong side of the garment and finished with the stitching application of your choice. Sealing the bias strip ends in the correct position will ensure that the whole bias facing strip lays flat against the garment layer, which not only results in a professional application but also facilitates the stitching process.
Note: This technique is used when the bias strip ends are not stitched together into a seam but rather left open as t os attached and stitched to the garment's hem edge.