LEVI'S 501 Crop in Blue. - size 31 (also in 24) LEVI'S 501 Crop in Blue. - size 31 (also in 24) 100% cotton. Button fly. 5-pocket design. Intentionally destroyed areas. Intentionally faded areas. 15 at the knee narrows to 13 at the leg opening. Imported. LEIV-WJ79. 36200 0012. Levi Strauss & Co., established in 1853, is a brand with a loyal, worldwide following. Their innovation with the co-invention of the blue jean was an integral part in creating their culture of self-expression and American cool that still resonates today. Each ready-to-wear design produced by the iconic label is made with special attention to craftsmanship, progress, and sustainability.