The Origins of the Name Filo di Scozia

Filo di Scozia is produced using precious long-staple Egyptian cotton, which grows exclusively in the Nile Delta and whose exceptional physical properties allow for the production of extremely fine and comfortable yarns that are also very durable.

but then why "Filo di Scozia" (Scottish thread)?

 Tradition has it that an Italian textile producer, in the second half of the 19th century, traveled to England in search of fine yarns. His fortunate encounter with the chemist and textile fiber scholar John Mercer (1791-1866), originally from Lancashire and inventor
of the process called mercerization, allowed the producer to discover the advantages of the yarn treated in this way. Subsequently, the Italian imported the yarn and began to promote it worldwide, gaining great acclaim.

It was thus that, from the second half of the 19th century, Filo di Scozia became the best of the yarns produced by J&P Coats, a yarn factory in Paisley, a Scottish town located in the west-central Lowlands, along the White Cart River.

  Hence, the name Filo di Scozia has remained unchanged over time. ..