Can Google’s AI try-on tell you which clothing size to buy?
The trousers fit beautifully in the generated picture. You still haven't tried on the trousers. Google's existing Try-On help page says the image does not determine or guarantee actual fit. It also warns that body shape and clothing details can be wrong, and that the merchant determines which sizes are available. A convincing picture isn't evidence that the pair you can actually order will fit. I'd use it to decide whether I like the look, then choose a size from the seller's size chart, product details and relevant reviews. Check the return terms before letting a flattering preview talk you into an uncertain purchase. If the seller hasn't supplied enough sizing information, generating another picture won't supply it. For the US selfie option, Google even lets you select your usual clothing size to improve the generated body's accuracy. That is information you're giving the image maker, not a size recommendation coming back from a fitting. This is a reading of Google's documentation, not a try-on test or evidence about return rates. I'd want ‘Which size should I buy?’ answered separately from ‘Do I like this outfit?’
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There's an earlier point where someone could get stuck: finding the same dress in a different search result and wondering where ‘Try it on’ went. Google's guide says the button isn't available on Sponsored products, and not every other item is eligible either. So a missing button isn't a reason to retake your photo or assume you've done something wrong. I'd put that explanation in the shopping help beside the feature, rather than send someone back through photo setup. That's a design suggestion, not a screen I've tested. It should be easy to tell ‘unavailable for this result’ from ‘there's a problem with my picture.’