Students, even professors in the U.S. seldom wear formal dresses. Suits are rarely useful in daily life. But it might be worth bringing one set of suit with you in case of formal occasions. A lot of clothes we bought in China will shrink if put in dryer. You'd better buy those with good quality.
People usually change clothes, e.g., T-shirts, pretty frequently.
So make sure you have enough clothes, e.g., T-shirts, underwear, pants. We suggest that you bring clothes made of cotton. Sports shoes here are not very expensive and of good quality. And they are worn most often here. It is not very cold in the Winter here.