there are a few problems the body and skin can rot showing that its has died before the insident. this can be overcomed by burning the body instead. you can make the "acsedent" here
the next problem occurs when the sewing equipment doent burn at the same rate. to fix this, although unethical you have to make the thread from human flesh
but if people manage to get to the scene quick enough they will find that the skin has seams. these cause disaster and so far i cant think of a way around it besides just having them "living" out in the woods