Before the edo period, the word "bath" of kimono meant "hot water", and people called kimono "bathrobe" at that time. Curtains refer to single clothes, that is, clothes worn alone. The ancient bathrooms were basically steam-type, which is very similar to the sauna now. In order to avoid being scalded by walls and columns, people wear soup curtains to take a bath. Tang Weizi, known as "kimono", began in the Edo period. Later, people gradually changed the form of bathing. When taking a bath, they no longer wear clothes, but soak in hot water. As a result, kimono became a simple dress to wear after bathing, and it continues to this day as a dress that reflects personal summer leisure interests.
In addition, in the backstage of kabuki and other dramas, many actors rest in kimonos, and they don't put on their costumes until the moment before their turn to appear, completing the transformation of their personal roles and performing.