I've been looking into this too.. trying to figure out how his outfit is layered/put together etc.
As far as I can tell there's 4 main layers (talk about warm
There's the typical pirate style shirt with ruffled cuffs.
The next layer is like a sleeveless, linen/cotton, trench coat. You can see the collar under his hood.
Next is the military style, front fastening (there's probably a proper name for this type of thing), ivory/blue vest. The collar from the linen trench folds over this.
Then finally we have the thick leather vest.
Not yet sure about the hood attachment, as well as the arm leather.
Certainly a lot of detail in there, yikes.
Edit: On second thought, that blue collar might be part of the vest, and the lower hanging blue material may be something like a tunic.