Carole White – who discovered Naomi Campbell and managed some of the top supermodels of the 1990s – said: ‘It’s a bit old and safe.

But I suppose she is pitching it right to fit her role as a senior Royal.’

She claimed Kate should be influenced by the Home Secretary’s style, which includes bold colours and animal-print shoes.

The 64-year-old founder of Premier Model Management added: ‘I admire how [Theresa May] dresses. It’s bold, modern and fun for a politician… playful yet stern.’

Ms White – who once turned down Kate Moss for being too short – also revealed she believes the UK is unlikely to produce any more supermodels because British girls are too ‘lazy and spoiled’.

Instead, the best models now come from Eastern Europe.  www.dopoosportswear.com

‘They are more disciplined and have a hunger to succeed,’ she said. ‘It’s probably because they see it as a way out of poverty. They’re tough and willing to put in the work to make it to the top. They are ready to do anything to achieve it.’

British girls, she said, ‘haven’t got the fire’. ‘They come from, say, Newcastle, and don’t want to leave their family or boyfriend. They think it’s easy, but you have to look after yourself. It’s hard work.’

In her new book, Have I Said Too Much?, Ms White reveals the pampered lives led by models: ‘Before I had written a word, Naomi’s lawyers were on the phone to say “We demand to read this book”. I told them to s** off. I never did bother sending them a copy.’