Wikipedia
The is an extremely elegant and highly complex kimono that was only worn by court-ladies in Japan. Literally translated, it means "twelve-layer robe". The older term, still used by scholars but not widely recognised in mainstream Japan, is . This is in reference to its Chinese coat (Karaginu) and apron-like train (Mo), the defining parts of the costume.
The jūnihitoe started to appear around the 10th century during the Heian Era. The various layers are silk garments. The innermost garment is made of white silk, followed by other layers which have various names, which are finally closed off by a final layer or coat. The total weight could add up to 20 kilograms.
The colours and the arrangements of the layers are very important. The colours have poetic names, such as "crimson plum of the spring". The only place where the layers are discernible is around the sleeves and the neck. The arrangements of the layers and their colours were a good indication to any outsider what taste and what rank the lady had. Apart from their robes, Japanese court ladies also wore their hair very long, only cut at the sides of their faces in a layered fashion; the longer hair was sometimes worn tied back.
An important accessory was an elaborate fan, which could be tied together by a rope when folded. This was used by the lady not only to cool herself, since it could get very hot, but it was also an important communication device. Since a lady was not allowed to speak face-to-face to a male outsider, she could hold her sleeve up or use her opened fan to shield herself from inquiring looks. Communication to a suitor had to follow with her normally hiding behind the sudare (screen or blinds) in any case. The suitor could only see the sleeves of her jūnihitoe that were peeking underneath the blinds. This practice was prominent during the Heian-Era, being frequently and accurately described in the Tale of Genji (jp: Genji monogatari).
The movement in such a robe could be difficult due to its weight. Ladies actually slept in their jūnihitoe sometimes, using it as a form of pajamas. Layers could be shed or kept, depending on the season and the night temperatures. During the Muromachi-Era, however, the dress was sometimes reduced to five robes (known as a "five-layer robe").