Isaia registered their own tartan. I’ve seen it in person. It is the bomb.
“Created for the ISAIA FW 2011-12 Men’s collection for its presentation at the Pitti Fashion Fair in January 2011. In the early 1920s, Enrico Isaia opened a small drapers shop in Napoli where he sold fabrics for the production of fine men’s garments. In the 1950s the business relocated to Casalnuovo where he established a small workshop with his two sons. ISAIA manufactures beautiful made-to-measure suits and has become one of the most of the respected tailoring companies in Naples. Today the company exports the ISAIA collection worldwide.”