It's nice, many e commerce brands are moving to AI technology. I recently visited one website where they were having AI for custom the uniform design. Can you believe this? Well it amazed me.

Not sure that Ai will show a proper fit. People want to know if something is baggy, tight, how the material moves to see how thin/cheap it is, etc

You already don't get this with fashion photography. "The model is 6'1 and wearing a size M" is meaningless when you don't know their weight, dimensions, or whether they've clipped the back to make the garment appear trimmer for the photos. Trying an item on in person is the only way to know whether it's good, and that's the potential AI disruption I'm most interested in.

I would be VERY happy if I could use my own sizes on a proper 3d model and see if it fits

Zara is crap (buy something, wash it, changes shape, throw it away). So it is no wonder they also use crap to promote their clothes.