Betty's tip about cutting her husband's frayed cuffs off and making long sleeves into short, reminds me of how I have extended the life of some of my husband's nicer shirts that have frayed collars.
Use a seam ripper to open the seam the collar is sandwiched between. Then pull out the collar and flip it over to the opposite side (which will look brand new); then set it in the opened collar seam, match the thread as well as you can, and stitch the seam back up. The frayed side will be turned down now and hidden, and your favorite shirt can be used a lot longer!
By Paula W