When not wearing super-cool, pop-culturely infused t-shirts that nerds everywhere clamor for, Sheldon Cooper wears striped shirts. Tons and tons of drab, unspectacular striped shirts. Here's another one from the BDG brand, previously sold by Urban Outfitters. This time of the blue and gray variety.
Featured on The Big Bang Theory episodes
S01 E10: "The Loobenfeld Decay"
S03 E14: "The Einstein Approximation"