I once knew a lady, who had quilted since she was a teenager, who was almost 90 years old, who would add Batting strips, or filler of some kind to her binding. She said if the binding was "filled" completely, it not only looked better, but most of all it would not wear out so fast. I have noticed on some old quilts I have, that are washed pretty frequently, the binding does wear out first. I don't know why she didn't just take a bigger seam to fill her binding, but maybe it would alter the size of the squares etc next to the binding?