swimsuit patrol

I came across this image on Shorpy - the 100-year-old photo blog just now. And as Amy and I will be taking the kids swimming a little later, it seemed appropriate to post.The caption reads:

"Bill Norton, the bathing beach policeman, measuring the distance between knee and bathing suit on woman in Washington, D.C. Col. Sherrell, the Superintendent of Public Buildings and Grounds, issued an order that bathing suits at the Washington bathing beach must not be over six inches above the knee. Photo from the National Photo Company Collection, 1922."

I wonder where I can find me one of those (the swimsuit, not the bathing beach policeman...).