Lambswool Zip Neck Sweater in Grassland Blarney Viyella Shirts, Sweaters, Jackets and Accessories Collection The Abbey Shop Viyella at The Abbey Stylish Shirts Sweaters and Jackets 14zipmockviy19. Expertly crafted with 80% lambswool and 20% nylon, the Viyella Lambswool Blend 1 4 Zip Mock Sweater boasts a luxurious softness and durability for long lasting comfort. Perfect for chilly days, this sweater is sure to keep you warm and stylish with its dark burgundy color and classic mock zip design.