Arpenteur Ss26 Sigma High Density Linen Unlined Overshirt GreigeThe Sigma is between a shirt and a jacket, featuring details from both categories. It is made of highly twisted linen fabric. The flexibility of the material allows the shape of the Sigma to fully show through. Woven from a highly twisted linen yarn, this fabric develops a naturally slubbed, irregular surface that gives each garment its own distinct character. The tight twist creates a light, open structure with a dry, clean hand. Specially treated to