1. Online search: You can enter keywords such as "underwear customized privately" in search engines such as Baidu and Google to find related brands or customized studios in official website or offline stores.
2. Off-line consultation: You can go to a professional underwear store or a customized studio to find out if you can provide private tailor service. Some high-end underwear brands also provide personal tailor services. Relevant information can be found in the brand official website.
3. Social media: You can follow the official accounts of some underwear brands or customization studios through social media platforms such as WeChat and Weibo to learn about their latest customization services.