If anyone has seen a "naked body" scan done at airports in the US today, they technologically remove all your clothing and hair to find contraband. They are black and white images that are creepy and very revealing. I would like to play on that with a shirt that mocks the TSA and this indignity.
I could an imagine a blue shirt in the same color the TSA personnel use with TSA on the sleeve to look somewhat like their uniform to enhance the irony here. You might look at the TSA.Gov web site to get ideas on how they do their lettering on their own uniforms.
One concept is to create an image like one of these body scans with the person having a shocked expression and hair standing on end (I know there is no real hair in one of these scans, but it will be fanciful). Think the kid's expression on the Home Alone movie with his hands on the side of his head instead of the position the TSA requires with the hands above the head.
There could be a full body scan on the back and just the head on the front of the t-shirt. This shirt should not be pornographic so a fig leave over the naughty bits would be appropriate or a silhouette of a hand to creatively accomplish the same thing.
The image of the fully body should be a male and flattering if an actual image, but need not be a body builder. The images from these scanners can be faked fairly easily (just Google it).