Personally I think the back looks excellent on you Ramirez. The pockets seem to be sitting in the right place. I had these in thin Finn but returned them for that exact reason. I've since picked 3 thin finns.
Love the shirt too.
Oh btw, liked your look on the WDAYWT thread but if I could add a little critique, I wouldn't of gone with the boots, double denim would've looked a lot slicker with a nice pair of plims. Cons, for example. For me, it would balance out the slimness of the jeans. Or if you want a smarter look try some suede chukkas or suede brogues maybe.
Black, navy, blue, denim. Depends in your taste. I personally wouldn't wear em with a shirt. Tees only. Maybe a nice knit.
I never wear "washed" jeans with a shirt. Raw, black and very plain pairs only. Maybe some grey ones. Unless it's a casual look then check or denim shirts only.
Cheers buddy! They kind of similar to 805A. They are originally green cast raw denim with dusty undertone in the original cotton. Worn down naturally like a standard stretch twill wash. My absolute favourite nudie wash. I get loads of wear out of them.