Make a stenciled shirt with duct tape.

Step 2 Shirt & Design.

As shirt I chose a simple white singlet, but I recommend using smooth textiles that aren't necessarily fine rib. First of all, you'll need to think of a design. Preferably something with straight lines, easy to reconstruct with duct tape. The simpler, the better. You can find some black/white stencils at http://72.29.83.164/~stencil/stencils.htm
I chose a simple 3,5" computer disk, like I'm so cool.