As far as what you just said is concerned, it does not belong to trademark infringement. Trademark infringement must have the possibility of confusion. Although' Youyou' can be used to search for' Youyou' brand, the buyer who really needs to buy' Youyou' can completely exclude the seller of' Youyou' literally, so it does not constitute trademark infringement.

A business that directly uses "Youyou" may constitute trademark infringement. However, you still need to submit the certification documents of your registered trademark as an appendix, and indicate that the scope of application of the trademark is clothing, and you don't have this style of clothing, which proves that it is ok for that business to use the trademark fraudulently.