These are Kiko's Dana trousers from the 24AW collection. This item appeared in the first look and was a very rare model, only available at the Kiko Harajuku store in Japan. Various ways of wearing are possible depending on how you fasten the snap buttons, and you can even wear them like a jumpsuit, as seen in the look. The size is 44, which should fit most Japanese people. On Farfetch, there is only one size 48 left, and size 44 is unlikely to be available on the market. The retail price was also very high, and it's a rare item, so please take this opportunity to purchase it.