My flak vest might not cover the bottom button or 2. I haven't gotten the vest yet, so I'll have to try everything on first before doing any modifications to the Dickies shirt.
Those pant pockets could be tricky. They're the internal-style pockets, instead of the external jeans-style ones.
Girth belt, sash, other belts should cover the lower bits. A bit of velcro should keep the slit pockets closed (which is all that's required, I believe). And as Desago mentioned once you get everything on there's not much showing.
personally, I'm going to wait until I suit up a bit more before I decide what to remove.