That's "A Bittersweet Life" (excellent film btw - very sad though).
I think his suit was only solid black toward the end of the film.
For about the first hour, he wore a slightly shiny black suit with subtle stripes in a very slightly lighter (perhaps even shinier?) shade. There's probably a proper term for that (here in Germany, they're called "shadow stripes"...)
I don't have a clue, but I thought he looked sharp as f*** in the movie