We sew our bias tape normally and a little before reaching the corner we will fold the tape creating a diagonal in which the edge of the tape is aligned with the edge of the fabric.
Fold the bias back on itself and you will see a sort of triangular tab that can be lifted and folded to the opposite side.
With the bias tape folded in this position we continue machine stitching and stop just at the beginning of what would be the seam allowance in the corner. If you notice it coincides with the point where you have to stop to avoid sewing over the flap.
Fold the tab back to the other side and start sewing again in the corner.
You have already seen at the beginning that for the bias binding to be totally perfect it is better to sew it in two steps. Well, in the case of the corners this is even more important than before. Here we would have step one ready and it would be time to turn it over and start closing the “sandwich”. You can see that the triangular tab is loose. We start sewing the bias binding normally and before reaching the corner we fold the bias binding that we would find facing us while sewing and then we fold over the side we are sewing at the moment. Once we have the bias binding in place we stitch all around the edge.
See you soon!