What clothes are suitable for going to Germany, France, Italy, Switzerland and Holland in August and September?

When I went to Germany, France, Italy, Switzerland and the Netherlands in August and September, the temperature was generally high, but the temperature difference in most parts of these countries was still very large. Therefore, it is recommended to bring some clothes in spring and autumn, such as T-shirts, shirts and jeans. At the same time, you should also prepare some light coats, such as windbreakers or jackets, to cope with possible cooling and strong winds. Besides, rain gear is also necessary, because these countries may have showers or cloudy days in August and September. Generally speaking, it is recommended to wear light, breathable and comfortable clothes, and at the same time pay attention to the appropriate collocation according to the weather conditions and places.