Safty-Pin
Here are the images to use:
<-- FRONT (*Click ME for full size for shirt use*)
<-- BACK (*Click ME for full size for shirt use*)
Instructions:
Get a completely white shirt (doesn't matter if it's a t-shirt or a tank top, etc)
Print the images above on regular paper
Pin them to the front and back of your shirt as indicated (safety pins work good)
Example from Last Year:

