... then build a platform that feeds a consumer's measurements to a secure environment controlled by the brand/designer, render the result there, and send the picture back.
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.
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.