D.C. policeman Bill Norton measures the distance between women’s knees and the bottom of their bathing suits at the Tidal Basin bathing beach in June 1922. That summer, the superintendent of D.C. public buildings and grounds ordered that suits not be...

D.C. policeman Bill Norton measures the distance between women’s knees and the bottom of their bathing suits at the Tidal Basin bathing beach in June 1922. That summer, the superintendent of D.C. public buildings and grounds ordered that suits not be more than six inches above the knee.

Let’s hope Officer Norton isn’t in Rehoboth Beach, Del., this weekend…