If it is not too thin, casual people can wear close-fitting clothes, such as a simple T-shirt and straight jeans.
If you want to take a slightly more mature route, you can find a loose shirt-style dress with a belt at the waist, which is both wet and not too thin.
Want to take a cute and playful route, find a close-fitting vest, add a slightly stronger coat, and wear a pair of close-fitting shorts to wear a young and beautiful feeling.