We recommend your usual size. If you sit between sizes, it would be safe to size down. Designed for a relaxed, oversized fit, the Swan Wavy Dress offers plenty of room through the bust and waist for all-day comfort. The model is wearing a size 16, which is her usual size, and is 172cm tall. The adjustable tie-front bows add flexibility through the bust, and the above-knee length keeps things easy and breezy.