And exactly how can they make sure that the uniforms are made in America unless they take control of the companies that make the uniforms.
Last I looked the U.S.O.C. takes bids for corporate sponsors and set up contracts specific to costs and performances.
If you tell a company where they have to make the uniforms, the costs can go up significantly meaning that either the U.S.O.C. gets less gear for the athletes, or the company doesn't make the profits that they planned on.