There is no uniform for college students. They wear their own clothes every day. They are free to wear whatever they want. If you really don't know how to choose, like some basic clothes types, such as T-shirts, shirts, sweaters, casual pants, jeans, sweaters, vests, coats, cotton-padded jackets and down jackets, you can choose the most basic colors: black, white and so on. These colors are more versatile.
If you want to change your dressing style, you can browse and find your favorite bloggers, learn some bloggers' collocation rules and color matching, choose within your own ability and do what you can. Don't blindly choose some clothes that don't suit you.