The Madison is 100% cotton and has sizes S-XL.  It has an elastic waistband. We recommend washing in cool water and with like colors.  The dress is running true to size and the model is wearing a small. Measurements: Length: Small measures 16.5", Medium measures 16.75", Large measures 17.00", Extra Large measures 17.5" Waist: Small measures 26", Medium measures 28", Large measures 30", Extra Large measures 32"