The waist is elastic from the armpits to the back, making it comfortable.
It looks like a beautiful twill weave fabric, but it's actually a very stretchy cut-and-sew material. The back is lightly brushed and has been treated with an anti-static coating to prevent crackling.
"Black dope-dyed yarn" is yarn spun from fibers that have been colored in advance. It is less likely to fade than regular piece-dyed yarn, and is characterized by its clear, beautiful color.
The easy-care material is machine washable. It's wrinkle-resistant, so you can put it in your bag and take it on a business trip.