Guys,
I don't know if this helps, but I'm at a lot of the same shows as propstore, so I'm forever drooling over the costume.
I've had a good look at the trousers and there's something I may be able to add.
These are definately not off the shelf - when you get up close (and trust me, I have!) they are in several peices.
While the knee is padded, it has many lines of vertical stitching in it.
However, the strip obove and below the knee is actually a black mesh, to let in air (I assume) due to the heat (again a guess). The mesh is actually quite thin and flexible.
Next - below the knee - this almost looks like just a strip around the leg.
(still havent quite worked it out yet)
On the sides of the trousers is what looks like an extra layer of material which starts from about the front middle of the leg at the top to the side seam as it goes down the leg. (both front and back)
I have no idea with materials, but if you get close to the material, you see a criss-cross pattern - I don't know if this makes sense.
It looks to me like a heavily modified pair of BDU's with the pockets taken off and then some added back on after the side piece.
Also, the buckles (both belt and thigh holster) are metal, made to look tarnished.
Hope this is of use
Ah - I will say that for letting me look closely, I promised I wouldn't post pictures up (which is lucky, as all my photo's came out really bad due to having the wrong setting on my camera, which I'm gutted about!)
As for the pistols I bought 4 cheap springers and pretty much hacked them to make them as close as possible - If I can dig out the pics I'll post up and you can give me tips on finishing!
Lastly, for any UK punishers out there, I actually found a pair of trousers very close in sainsburies - I've just bought 2 pairs - one to hack up to mod the first. Again, if it works, I'll post them up.
Jon