If you don't know your oil pan from your cooling fan, it doesn't matter. With the Auto Engine Diagram by Slow Loris, you'll be talking shop in no time thanks to the twenty-two labeled parts on this vintage V6. (Though be advised -- engines have more than 22 parts.) T-shirt artist Jessica Lynch brought this tee back from a ten year retirement, and it's still finding popularity among hipsters and grease monkeys alike. Our favorite diagram label? "Horn."

Slow Loris's tiny team of t-shirt artists hand screen every t-shirt from hand drawn doodles, and only use American made, sweat-shop free tees. (Though the team occasionally break a sweat while working in their cozy shop.) Own a t-shirt that has human thought and effort put into every stitch and stencil.