Rita Phil only needs 3 simple measurements from you: your waist, hips and thighs. Those numbers are then plugged into their design system, along with your height and a hand-drawn custom pattern is created for your body. Every skirt undergoes its own analysis, and a separate pattern is made for every single different skirt they make.
Rita Phil then manufactures everything in their in-house studio and then ships it directly to their customers. All the middlemen are cut from the process so they are able to pass on the savings to their customers.