1. The Issey Miyake brand itself does not emphasize trademarks: This situation is relatively rare, but some brands may not clearly indicate trademarks on their products due to special design concepts or marketing strategies.

2. Purchasing channel issues: Some purchasing agents may obtain goods from informal channels in order to avoid taxes or maximize profits. At this time, the goods may not have trademarks or the trademarks may have been tampered with. In this case, it is recommended to choose a reputable purchasing agent or an officially authorized sales channel and carefully verify the product information before purchasing.

3. Changes in consumer demands: In recent years, more and more consumers have begun to pay attention to the quality, design and cultural connotation of products, not just brand logos. In this case, some brands may gradually reduce the use of trademarks and focus more on the characteristics and value of the product itself.