Max + Ash women's dress size small

Selling a Max+Ash dress. It is in excellent condition, though I have worn it a handful of times. It says that it is a size small, but I feel that it fits more like an extra small. With the buttons extending to the bottom, I found that because the fabric is stretchy, any pulling was more obvious, so I'd suggest this for a dress size 0 or someone with smaller hips than I have! I would describe the color as rust or burnt sienna.