I have worn these for years, its my go-to flip flop and house shoe, but eventually after wearing every day they wear down.  I just bought a pair and they are the same size I always buy mens 5/womens 7 and they are 1/2 inch bigger than my last pair of the same size.  I don't understand how the size fit can change that much.  Sending them back I guess for a smaller pair.  Really disappointing.