There may be many reasons behind the phenomenon of domestic clothing sizes getting smaller and smaller, including different understandings of health and beauty and manufacturer decisions. Body bullying and aesthetic distortion both play a role, but cannot fully explain the phenomenon.

1. Market demand: Smaller clothing sizes may be related to market demand. With people's pursuit of health and beauty, and the increase in consumer purchasing power, consumers may tend to purchase more slim-fitting clothing, which has led to the increasing popularity of smaller-sized clothing.

2. Aesthetic standards: In the past few decades, the aesthetic concepts of many countries have changed. The concept of thinness as beauty is becoming more and more mainstream, which may influence clothing companies to establish size standards. However, too narrow and single beauty standards may connotate body bullying for some people, and may also easily lead to stereotypes and negative emotions about body shapes.

3. Cost saving: Manufacturers may make the overall size smaller in order to reduce costs. This results in less fabric and other materials being used during production, thus reducing production costs.

4. Cultural factors: The cultural background of different countries and regions also has an impact on the choice of clothing size. For example, Eastern cultures tend toward more slim-fitting clothing, while Western cultures may place more emphasis on individual comfort.

The phenomenon of smaller and smaller domestic clothing sizes involves not only changes in aesthetic concepts, but also manufacturer decisions and market demand. Body bullying and aesthetic distortion can be seen as some of the reasons for this, but the entire process is also influenced by a variety of other factors.