I have had this same size and style of dearforms for years. Suddenly, they no longer fit and they are of shoddy workmanship.  The fabric is much thinner and feels like something you would feel on a carnival toy.  The soles of the slippers are not as flexible as they should be.  I am very disappointed in Dearforms.  My first pair lasted about 10 years with outside wear and regular washing. They just finally wore out.  My last pair lasted less than one year. The sole broke and the seams tore about the same time with very limited outside wear.  I was going to give them one more chance - immediate failure.

Instead of returning them, I donated them.  It would cost more to send them back.