The Hanten is a Japanese quilted jacket. This one is reversible, with 2 outer and inner pockets.
Formerly it was worn over a kimono, but no one will blame you if you wear it on saroual or even on jeans!
Even if it looks like silk satin it's actually polyester, so it can be washed at 30°C.
M: Chest 88-96cm, recommended for 168-175cm height
L: Chest circumference 96-104cm, recommended for 175-185cm height