courts, obviously. But the Duchess Of Cambridge is also really good at introducing us to niche new brands that we would never previously have heard of.

She’s the ultimate fashion diplomat, whose impeccable style choices have been known to build bridges between nations (remember when she tactically wore Canadian-born British designer Erdem to kick off her royal tour in Ottawa, or wore this dress in Poland?), and the Kate Middleton effect leads to an instant sell-out of any item she wears.

‘There is no question that Kate choosing to wear Reiss has impacted our brand,’ David Reiss, Founder and Managing Director of Reiss told us. ‘We have noticed a significant increase in terms of brand interest and awareness globally, strengthening existing markets and attracting attention in markets we are yet to enter.’

Getting Duchess Kate’s seal of approval is the ultimate honour for any fashion brand, but the impact her endorsement can have on small businesses in particular has been known to literally see tiny labels launch into fully fledged companies overnight.

‘I was so excited the first time I found out that the Duchess had chosen to wear one of our dresses,’ Natasha Rufus Isaacs, co-founder of ethical fashion label Beulah told us. ‘We were a relatively unknown and young label, and it definitely helped spread the word about us and the cause that we support.’

Kate Middleton’s favourite fashion brands

Find out more about Beulah, Reiss and all of Kate Middleton’s favourite high street and designer fashion brands below, plus shop our edit to recreate her royal wardrobe. Don’t forget to check our Marie Claire vouchers site before you shop for the latest offers and discounts.