Cruzer, I think you are looking at BDU when you need to be looking at ACU.. Propper has an ACU pant with the slant pockets... but so far I haven't found it in black and I think they have two additional pockets low on the leg...
ACU pant pockets use velcro (as does the rest of the suit)...
Where do you see the slant? I can't seem to notice the pocket being angled.
Definatly modified BDUs though
Check the first pic... the fly is velcro...
And the second pic shows the angled pockets.
Upon looking at this more closely, I am really wondering more and more if these aren't modified, but are completely custom made.