I'm pretty sure you need the whole hazmat suit to protect from radiation, as gamma radiation will easily go through anything but lead and similar materials.
It still goes through lead, but lead is a dense material and so requires less of it to stop gamma radiation. 1cm of lead to reduce intensity by 50% while it'd take 4.1cm of granite, 6cm of concrete, or 9cm of soil to achieve the same. So..denser material = better shielding. Can we say dense lead plates possibly?
Though your post does point out an interesting problem. the hazmat suit is made of rubber and orange dye and not lead..so..just of what use is it then?