Rocking a Time T-Shirt ($37) with a fully-functional digital clock ups the ante. The shirt uses electro-luminescence technology — a very weak electric current that passes through the shirt, causing the material to generate light and display the time. Don't worry, it doesn't radiate heat or use hazardous materials.
The shirt is powered by two AAA batteries (ha! How many times do you get to read a sentence that geeky?), and is 100 percent cotton and completely machine-washable. What do you think?