There's "Polo by Ralph Lauren" -- everyone knows that. But there's also the "United States Polo Association" (USPA), which uses a similar trademark utilizing the word "Polo" and an outline of a polo player on a horse.
Perhaps you or a loved one has become confused in a department store, as you -- a reasonable consumer -- can't discern the difference between "Polo by Ralph Lauren" and "U.S. Polo Association." Are they the same? Are they different?