NWT Hill House Fiona Dress. Fiona is crafted from a washed twill fabric that holds its shape beautifully, giving structure to its ultra flattering a-line shape. A removable D-ring belt provides a perfectly cinched silhouette -- we love a waist moment. The corset-inspired bodice and skirt feature contrast stitching throughout. XS Measurements 30-31 Bust 25-26 Waist 52 Length About the Fabric Twill is a soft, durable fabric that sits in the sweet spot between denim and canvas -- it's softer and lighter than both, but still sturdy and structured with a gently lived-in feel.