You should be ready to slip into your rig and have a friend attach the sign portion. You can put the sign on before if you like but it is cumbersome. ...
Some fine folks where I live organized a "Zombie Walk" fundraiser and i just knew I needed to take part in that. But, I also knew my makeup skills were lacking. I needed a prop to get me through with my dignity intact. But what? I know! A striking zombie body impalement would do the trick.
If you can scrounge a standard yard sale sign, the kind on a wooden stake, you'll be ahead. If not, they are easily made. You'll need two USP lumber connectors which you can find in the lumber section at Home Depot or Lowe's or the hardware store of your choice. Get the long ones since they have to bend all the way around your torso and over your shoulder. This depends on your size - bolt two together if needed. Get two L-brackets with four holes total. (See pictures) You'll need four small nuts and bolts to tie the whole contraction together and four nails or pins to attach the actual sign to the rig. More on that in the next step. as far as tools go, you won't need much. A drill to put some holes in the lumber connectors and a hacksaw to takes the tips off your nails. You'll need a screwdriver and pliers to tighten the nuts and bolts.
Step 2: Step 2: Fitting and building the rig
Start by bending the lumber connectors around your shoulder and under your arm. Go slowly and get the bend just right. After wearing it for even a short while, you'll come to appreciate taking the time to get it to contour to your body. When you have both lengths of connector bent to conform to your torso and overlap like in the pictures, you can mark where they need to be drilled (unless you get lucky and the existing holes in the connectors line up). This is a case of purely eyeballing it and drilling approximately where you think it will work.