(羽織) is a hip- or thigh-length kimono-like jacket, which adds formality to an outfit. Haori were originally worn only by men, until it became a fashion for women in the Meiji period. They are now worn by both men and women. Men's haori are typically shorter than women's.
(羽織紐) is a tasseled, woven string fastener for haori. The most formal color is white.
Haori literally means "Folded Wing" and they were popularized by Geisha during the Edo period.
They can be worn as a blazer with Western style clothing. Since they are all hand stitched and the seams are blind stitched they can be worn inside out as well as right side out.
The haori is a lightweight silk jacket used to help keep the kimono clean and dry. They vary in length and are considered an essential part of ceremonial kimono attire for men but not for women. It probably came from the dochu-gi which was a cape worn for travelling.
One special kind is the kuro montsuki which is worn for school events like entrance and graduating ceremonies and for mourning. In general, the wearing of haori by men was well established, but the wearing of them by women did not become popular until the Edo period.
They are meant to be worn open. It's usually taken off and folded up before one enters the place they are visiting.
Formal haori have the family mon on the back. It is has a single crest at the back mid seam it's called kuro montsuki haori and is usually worn for school events or for mourning.
The haori can also be of different lengths, the long ones being for dressy wear, the medium-length ones for ordinary wear, and the shortest ones for wearing at home.
The Japanese take great pains to store their traditional garments with the utmost care, which is why they stay in such exceptional condition. Some of my Japanese garments have large, white stitching (shitsuke) round the edges. The Japanese put these stitches in to keep the edges flat during long periods of storage, these stitches just get pulled out before wearing the garment.
New, custom-made kimonos are generally delivered to a customer with long, loose basting stitches placed around the outside edges. These stitches are called shitsuke ito. They are sometimes replaced for storage. They help to prevent bunching, folding and wrinkling, and keep the kimono's layers in alignment.