Choose size based on your body measurements, both waist width and hip width. Sofia has negative ease in order for the skirt to have a figure-hugging fit. It’s therefore important to choose a fabric with 30-60% stretch. If your fabric has less stretch, consider sizing up. If your fabric has considerably more stretch, around 100%, consider sizing down or be prepared to take in the side seams.
All measurements are listed first in cm, then inches.