Pretty good so far, man. Not too much to say about the form yet, the biggest thing I'd mention is geometry layout.
I agree with the above. For the crotch, I'd try and avoid having the legs meet each other like that. It'll work much nicer to give a couple quads padding for the groin. For the arms, I think you've overdone the 3-loop joints thing. Check out this limb deformation gif.
I'd spread the loops out a bit and knock out part of the middle loop on the inside.
Also, to make your life easier, I'd make the kneepads and straps part of the same geometry as the pants. At least the straps, because they don't do anything to alter the silhouette and will just mess with your deformations. If you're doing the same thing for the belt I'd knock that geo out too and just put it in the texture. As long as you paint your weights right it'll look the same and take fewer polys.

keep it coming, man