How to dress for a trip to Europe in early September?

According to which country you are going to, it is recommended to prepare a thin sweater and a thick coat. The temperature in Paris, France is similar to that in Munich, Germany. You can wear ordinary long sleeves and a coat, or you can wear a thin coat (depending on the weather), and you can take off your coat at noon. It will be cold to go to the snow-capped mountains in Switzerland. Please bring your own warm clothes. Generally, the temperature is not cold on sunny days. A long-sleeved coat and a beautiful scarf will be very European.