Some of my husband's nicest shirts were wearing out around the collar area. You know how the collars get dirty around the neck, you treat the stains and then the collar becomes discolored in that area. The rest of the shirt is perfectly good.
My mom recently taught me that I could rip the collars off of these shirts, turn them around and sew them back on so that the back sides of these collars is facing up to make the collar would look like new again. I do this only on my husband's good shirts!