Silk to be lawful for men to wear, but the dominant opinion of most Muslim scholars is that the wearing of silk by men is forbidden. Modern attire has raised a number of issues, including, for instance, the permissibility of wearing silk neckties, which are masculine articles of clothing. Despite injunctions against silk for men, silk has retained its popularity in the Islamic world because of its permissibility for women, and due to the presence of non-Muslim communities. The Muslim Moors brought silk with them to Spain during their conquest of the Iberian Peninsula. Italy was the most important producer of
History of silk regained their earlier role in silk production, and China is now once again the world's largest producer of silk. The rise of new fabrics such as nylon reduced the prevalence of silk throughout the world, and silk is now once again a rare luxury good, much less important than in its heyday. The earliest evidence of silk was found at the sites of Yangshao culture in Xia County, Shanxi, where a silk cocoon was found cut in half by a sharp knife, dating back to between 4000 and 3000 BC. The species was identified as "Bombyx mori", the domesticated silkworm.