I believe these are zori (Japanese sandals) that would go well with a slightly casual, everyday kimono outfit, rather than a strictly formal one. Although unused, they are vintage items, so there are stains on the soles and what appears to be dirt on the sides (see images). The length of the zori is about 23.5 cm. I wear a shoe size of 23 cm, and the actual length of the zori I wear is about 24 cm. These zori are too tight for me. The thong part feels stiff, but I'm not sure if this is because they are unused or due to aging. Please understand that these have been stored for a long time since the Showa era before purchasing. These will only be shipped on weekdays. Please note that recycled materials may be used for packaging.