No, but it is built for people who commission clothes. If your wardrobe is entirely ready-to-wear you can still record it — you’ll just find half the construction fields irrelevant.
Yes. Every body, lapel, pocket, cuff and buttonhole is drawn as a separate vector component in Inkscape and assembled to match what you specified. No stock photography, no generated images.
A photograph shows one jacket in one light. A drawing shows the specification — and can show a jacket that doesn’t exist yet, which is the point of the design builder.