Long sleeve midi shirt dress Simon and Pine Siphon Midi Shirt Dress Printed Midi Shirt Dress BAUKJEN M&S Ruched Midi Shirt Dress with Side Slit from OhSoStyled at Sophia's Reiss Shirred Waist Midi Shirt Dress in Khaki REISS Navy Midi Dresses at M&S. Polished yet effortless, the Siphon Midi Shirt Dress is your go to for refined, everyday dressing. Designed in a fluid satin twill with a soft sheen, this midi silhouette features a classic collar, short sleeves and a waist cinching tie belt to define the shape. Finished with a geometric stripe print, its a timeless piece that transitions seamlessly from workdays to weekend plans.