Goods related to the Olympic Games, except the top sponsors, shall not be advertised; In particular, clothing is absolutely not allowed to have obvious signs such as manufacturer's logs or related publicity; It is estimated that no third party knows the relevant information except the procurement officials of the Olympic Organizing Committee and the garment manufacturing enterprises, and it is difficult for the third party to know it in a short time. Recommend this book: The Great Reversal of the Olympic Games-Michael Payne (translated by Guo Xianchun, Lin Xue Publishing House of Shanghai Century Publishing Group). There is no answer you want in this book, but you can know why there is no answer.