A stylist holds cloth against your face and watches what it does to you. It works, it costs £100–300, and it takes an afternoon. Drape measures the same thing — your skin, eyes and lips — then hangs the answer on your own body.
Sit for it yourself
Two photographs. A head-and-shoulders shot where your face fills roughly two-thirds of the frame — that's what the analyser needs to read your skin — and a full-length one so garments can be hung on you.