A trench coat done in a way which only Junya Watanabe—and maybe a few other fashion houses—could get away with doing. Your eyes do not deceive you, this trench coat is wearing pants... Sort of...
The top half is a relatively straight-forward spot coat with three-button construction and flap pockets executed in wool suiting cloth. With horn buttons and a smooth acrylic lining it's a pretty standard fare, especially for a label under the COMME des GARÇONS line.
It's once we get to the second half where things get spicy, with a pair of un-constructed pants forming the tail. You're probably thinking 'yeah it looks like pants' but we really do mean they're pants. Aside from one un-sewn seam this looks like finished trousers. If you were in a pinch I'm pretty sure you could just unpick the stitching at the jacket, sew the inseam and have yourself some new cargos.