The mask is an altered Russian gasmask. The jumper is a vinyl cat suit I altered and made patches for using extra vinyl i had lying around, the burnt bit was made by spraying black spray-paint up the legs. The gloves are large industrial gloves I painted with plasti-dip. the harness is suspenders with spice cans for the grenades, and the back tank was made from 2 liter soda bottles.
I got a lot of help form this person's tutorial. [link]
but obviously I made some changes where I saw fit.