This ivory SIR. Maisie open back dress is crafted from silk and cotton. Cut for a relaxed fit, it features a high neck, three-quarter flared sleeves, panelled embroidered lace trim details, an open back, rouleau tie at the back neckline and an adjustable tie at the waist. It’s finished with a side split and a maxi-length hem. When it comes to your thoughts on this SIR. dress, we can read you like an open book. It was the huge grin on your face that gave it away, by the way.