Nationwide Banking App Apps on Google Play SIENNA MIDI BLOOM ORANGE. The Sienna Midi is a classic popover shirtdress. We love the side slits, and the optional sash that gives definition to this classic body. There are two pockets on the side seams. This silhouette flatters all body shapes and types. We are proud to follow ethical, sustainable practices during the manufacturing process. Sizes XS, S, M, L, XL, XXL Length 48" Fabric 100% organic cotton voile, with cotton lining Wash care Wash by hand in cold water. Hang dry. Gentle iron if needed.