Underwear brands suitable for flat chests are:

1. Gujin Underwear: Founded in 1988, a time-honored Chinese brand, a famous trademark in Shanghai, a famous brand product in Shanghai, and extremely influential in the domestic underwear industry One of the most powerful brands.

2. Triumph International Group: a well-known brand of bras, a well-known brand of shaping underwear, a well-known women's underwear brand, one of the most international underwear companies in the world, and a famous German underwear brand.

3. Nanji E-commerce (Shanghai) Co., Ltd.: Nanjiren, founded in 1997, is a famous trademark in Shanghai and a famous brand product in Shanghai. It was originally a well-known brand of thermal underwear and has now grown into a wide range of products. A well-known and influential brand.

4. Gorel: An underwear brand originating from European design style, a modern company integrating the design, production and sales of underwear.

5. Changxiang Shi: Specializing in the production and sales of flat-chested underwear, sexy bra sets, strapless underwear, small-breast push-up bras, bra sets, etc.

6. Tingmei Group Health Technology Co., Ltd.: a well-known brand of body shaping underwear, a well-known brand of bras, a well-known brand of radiation protection clothing, a famous trademark in Beijing, and a professional clothing enterprise in China with deep production and brand strength.

The above are some recommendations. For the underwear brand that suits you, you need to choose based on your personal needs and try-on experience.