Is it possible to go to Italy in June with a cotton-padded jacket?

No need. The average temperature in Italy in June is 16 ~26 degrees, which is comfortable. It is recommended to wear cool and breathable clothes such as shirts, thin skirts and thin T-shirts made of cotton and linen during the day and 16 degrees at night. It is recommended to wear warm clothes such as suits, jackets, windbreakers, casual clothes and thin sweaters, and it is not necessary to bring cotton-padded jackets.