Kimono of Japanese women experienced a process of imitating women's dress in Tang Dynasty to digesting and reforming by themselves.

日本的女子和服经历了一个对中国唐代女子服饰的模仿到自我消化改造的过程。

youdao

In the inn setting, you can consider yourself respectably attired for such a dignified supper if you dress in the cotton kimono provided in your room (bonus: you are dressed in what is essentially a bathrobe and can loosen the sash if you find that the meal was five courses longer than you expected).

BBC: Kaiseki-ryori: Japanese haute cuisine