Shantou has: American Standard, Xinshi Family (which also owns four household clothing brands), Fenteng, Anzhibian, Doraemon, Long Mu Family, Ricky, Shengpai, Jade Eggplant and so on.
Yes: Cornya from Zhongshan.
Zhejiang has: Kangrou, Fu Laosi.
Sichuan has: cotton bags.
Shandong: Youxian County, Di Mei.
There are also two brands: Duo Duo Cocoa and Yi Si Fen.
The above are the first-and second-tier brands in the industry, hoping to help the landlord. If the landlord is interested in this piece, I suggest you search for a person on Sina Weibo: "underwear, household clothes, pajamas", who knows a lot.