Size M The material is a bit static-y at first but also allows it to hugs your body well. I fit a small typically but a M was perfectly fine. Below is the product description: Silk Laundry bias cut dress crafted in 100% silk detailed with a round neckline with logo chain at the back. Cut on the bias to a fluid fit and ankle-length hemline. - Material: 100% Silk Sandwashed, 16 momme - Cut on the bias - Matte sheen - Ankle length - Round front neckline - Round back neckline with logo chain - Internal French seams - OEKO-TEX certified - Fits true to size - Model wears a size medium