I came up with this inner corner mitered technique when I needed to bind the inside corner of a fabric piece. Overlocking, interfacing, and topstitching didn't work, and tutorials only showed how to miter the outer corner. After much trial and error I came up with a simple method, I hope it will help everyone with their projects! :)
Before starting, take a quick look at my bias tape and stitch in the ditch tutorial to clarifying any steps below.
1. Right sides together, align the bias tape and fabric edges. Sew along the fold.
2. Sew past the perpendicular point, up to the seam allowance of the fold. The fold in this case was about 1/2", I stitched until 1/2" past the point.
3. Keep the needle down, cut TO and NOT through the needle. You will get a notch.
4. Pivot the bias tape and fabric so edges align. Sew along the fold.
5. Fold the bias tape up into a V, match up the folds if you can, and fold onto the other side.
6. Pin it in place if needed.
7. Use the stitch in ditch method, or sew it right on top to keep it in place.
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