In fact, this is also related to the personalities of the two countries. Nowadays, children in China generally like to express their individuality. How do they show their personality? Dressing is the most direct way. American students actually don't have that much burden. They will choose when they feel comfortable.
In fact, there are some differences in figure between Americans and China. Americans are plump, so they need to wear loose clothes. Most international students in China prefer to wear fashion cards because their grades are not excellent and their family conditions are relatively good, so their parents send them abroad for further study, and they often spend more time on dressing up.