X-Ray Specs on a T-Shirt

I spent way too much time reading comic books when I was a kid, and this was something that always intrigued me...X-Ray Specs for seeing through walls or doors or, more importantly, women's clothing.
This is the X-Ray Specs Women's Tank Top at RetroRanger, but the design is available on a whole array of t-shirts, sweatshirts, tanks, jerseys...plus gift items as well. We've always figured it makes a great gift for an X-Ray Tech.