Grover's Lab Coat
Presumably this shirt works best if you wear it under a lab coat.
A study published in 2012 in the Journal of Experimental Social Psychology showed that subjects who wore lab coats were more attentive and performed tasks more accurately than those not wearing lab coats. Which means everyone should wear lab coats, all the time. You'd ace all your tests. You could measure once and cut once. And maybe they wouldn't forget your ketchup at the drive thru, although we could be hoping for too much there.
"I'm wearing a lab coat. Your argument is invalid." with a picture of Grover in a lab coat on a 100% cotton, silver shirt. Officially licensed. Imported. Machine wash cold. Tumble dry low or lay flat to dry.