Since there isn't much else to look into right now maybe the jacket is a bigger clue than you would think. So here are some thoughts I have after studying the BG images for a while. Also Ive read that some think he was pasted into the bridge background. No way
you would see it in the pixels in photoshop if he was silhouetted and inserted into background.
To me the jacket looks like a lighter to medium weight nylon windbreaker type aka coaches jacket aka security style jacket maybe even a rain jacket. Not a heavy weight winter jacket.
I see a rectangular jacket pocket above the pouch that has a 2" flap and possibly 2 snaps almost like a cargo pant pocket or a field coat/jacket pocket but longer than deep. No pocket on the chest like field jackets have. I think the jacket snaps shut with possibly a zipper as well under the snaps, elastic wrists and lined with maybe a lighter gray colored lining. I think the jacket is only snapped a couple of snaps in his picture and is mostly open. I also think this type of pocket is why his hands are in his pants pockets and not his jacket pockets.
This jacket is different from most windbreaker type jackets ive seen because of this style pocket. I've noticed a lot of rain type jackets that have this style pocket. You can see many jackets on Amazon, Cabelas, sporting goods stores, Google images, etc., So I feel because of this pocket it eliminates many jackets.
I think hes a guy that has a larger build, I dont think the jacket is a disguise to make him appear larger. I think 180-200 lbs at the most and 30 years old, no facial hair to speak of but maybe some stubble.
He could be a sports coach, security guard, someone who works outdoors but not as a laborer. Maybe hes a foreman, an in the field customer service guy, utility company person, estimator for a contractor or a contractor business owner.
Maybe this guy has a habit of having hands in pockets all the time. Maybe a clue?
LE should get 5-6 talented fashion artists to draw this jacket from the best images they have and post pictures of it. Ask who owned one like this but now recently does not.