Kinda depends on budget. You could do a lot with pantyhose stuffed with polyesther fiber batting. Use string at the "joint" < elbows, wrists
etc> if you wanted to get real fancy you could even stitch the "fingers" into the hands. After constructing the arms and legs with pantyhose, you could
build the torso out of almost any stretch fabric, might I suggest my favorite,
Tricot. < which is available in "nude" for a realistic skin tone>
You could then get fancy and coat the hosiery with latex. From that
point its just a simple matter of creating makeup prosthetics < wounds, cuts, torn flesh
etc.> and applying them the same way you would a "real" actor.
Hmmmm what's the difference between a real actor and a dummy stuffed with fiber fill? You can
cover one up with dirt every night and equity won't complain.