Two minutes into that pitch, any and all major fashion corporations will kick you out the door. I spent significant time trying to crack this nut - the fashion industry culture at it's core is luddite, that and any tech that is not 100% transparent ain't gonna fly.
Everything can stay under the control of the designer, including 2FA of the end-user, the degree of fidelity of the rendering, rate limits for requests, timed release to selected partners, etc, etc.