Juuzou Suzuya is a Special Class Ghoul Investigator, that means that he wants to catch (and kill) ghouls… and they want to eat him. This is a perfect cosplay to go to a convention with a couple of dress-as-ghouls friends.
He has some very particular features that are kind of easy to emulate, so this cosplay is a winner every time.
First you will have to choose if you prefer to go with the manga or the anime style, because there are little clothing differences.
Manga: his attire consists of a white shirt with sleeves rolled up to the elbows, left halfway buttoned and yellow dotted red suspenders that support his black pants. He frequently wears a (too big) black suit jacket above all this, with rolled up sleeves too.
Anime: he wears a very light pink shirt, with red triangles on the sleeves (also rolled up) and its buttons in a different color each. The suspenders are mostly blue with a particular design (use a picture as reference). And the pants have a yellow and brown design bellow the knees.
In both cases he wears red slippers instead of shoes.
His hair es white, and his hairstyle pretty sloppy. He wears five red hairpins on his fringe, with the first two crossed forming an X and the other three one beside the other (the whole set of hairpins form the Roman numeral 13: XIII).
On his skin he has red stitches: a set of red threads appearing to be two x’s are stitched on below his right eye. Two more stitches on his bottom lip, a line of several stitching threads from his upper neck downward, and several more around his right arm and hand.
His irides are red. You can get red eye contacts to simulate his particular look. Perfect contacts for this can be found here: https://www.icrazyangel.com/collections/zombie-vampire-crazy-contact-lenses/products/tokyo-ghoul-crazy-lenses