I bought a new pair of glasses online on Saturday evening as I couldn't be bothered going to a store to try them on. The website had a "virtual try on" feature that would overlay the glasses on your face, and even though the result wasn't great (lighting was off etc. so it wasn't a genuine reflection of what they'd look like), I thought it was pretty cool / useful. An AI-powered version of that which could make it look real would be killer, as long as what you're shown matches the product and isn't some hallucinated bastardisation.