Instead, he thinks it was too much for Beatrice and someone like the late Isabella Blow could've done it justice.
The designer told Bergdorf Goodman's blog: "I'll probably get in trouble for saying this, but at the royal wedding, one of the princesses wore a now-very-famous (or infamous), Philip Treacy hat - that hat wore her.
"Now, Isabella Blow, a woman those of us in fashion knew well - had she worn the same hat, it would have looked great. She would have worn the hat. She knew what she was about, what she wanted to express in fashion."
In May, the outlandish headpiece - which had been likened to a pretzel and a cat flap - sold for $131 000 to an unnamed person on auction website eBay.
Beatrice admitted she was "amazed" by the comments her headwear attracted but said she was pleased to raise funds for children's charities Unicef and Children in Crisis by auctioning it.
In a statement on eBay she said: "I've been amazed by the amount of attention the hat has attracted.
"It's a wonderful opportunity to raise as much money as possible for two fantastic charities. I hope whoever wins the auction has as much fun with the hat as I have."
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