It would be completely normal for him to wear hand-me-downs if he had an older sibling or a cousin who wasn't too much older than him. I wouldn't be surprised to have seen Isla in her sisters hand me downs, or perhaps Mia in some of her cousins' old outfits (assuming that Peter and Autumn saved the clothes, which they might not have if they decided they were done after Isla was born). But for George to be wearing 30 year old hand-me downs is a bit of a stretch. Those clothes would be hugely outdated by now. If memory serves, the outfits that William and Harry wore as babies were a bit dated even 30 years ago. Why would they save clothes for 30 years when they would have been better off donating them once Diana and Charles decided they were done having children.