Sienna Wedding Dress, Modern Elegance With Classic Charm, Luxurious Introducing: The Sienna Dress The Modern Sewing Co. Introducing: The Sienna Dress The Modern Sewing Co. DRESSES SIENNA Designed in Lisbon Sienna Dress instoreclothing. brand: ownley description: the sienna slip dress is a bias cut slip dress made in an ultra soft cupro fabrication. featuring a racer style neckline and button closures on the shoulder strap. the dress is not lined to keep it light however it is not sheer. pullover style (no zipper). content: 60% cupro; 40% viscose model is wearing a size small item runs true to size