Capri Shirt Share definition Flag When a complete tool wears a shirt that's about 4 sizes too big and the sleeves are so long it appears he is wearing capris on his arms. Hey, Joe is a medium but he wears a 2x, it looks like he has on a capri shirt man. Capri Shirt by imovecars89 September 2, 2011 Get the Capri Shirt mug.