I know how to mitre the corners of a quilt (by folding up binding to 45 degree angle, quarter of an inch from the end then sewing at top of next side) and they work out OK. However I've just made a table runner and the angle is wider than the standard 90 degree corner.
How do I know how much fabric to leave unsewn in order for the mitre to lie neatly when I fold it over to hand sew? Is it more than I would usually fold, or less?
