Christian Dior
Getty Images Before Christian Dior became a world-famous hallmark label in fashion, Princess Margaret was one of the designer's biggest fans. According to People, Margaret's adoption of the brand as early as 1947 (and close friendship with the designer) saw her don several Dior creations, and expose Dior's couture to an entirely new audience.
Hunter Boots
Getty Images Now iconic British boot brand Hunter has been a favourite of the royals for eons, which has undoubtedly contributed to the label becoming a household name. Seen here on Diana in 1981, the brand received a Royal Warrant (meaning they're allowed to bear the coat of arms) in 1977, and are now a wardrobe staple for countless celebrities.
Issa London
Getty Images At the royal engagement announcement in 2010, then-newcomer Kate Middleton wore a royal blue dress by Issa London, which matched her engagement ring from mother-in-law, Princess Diana. The dress immediately became a global hit and sold out in 43 countries, according to Elle UK, and cemented the Duchess as a fashion force.
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Jenny Packham
Getty Images Already an established designer, British label Jenny Packham experienced surges when Kate wore dresses from the brand's ready-to-wear line after having both of her children. Packham's classic, eloquent designs have helped make the brand one of Kate's go-to's.
Reiss
Getty Images After The Duchess of Cambridge wore this nude mini by British brand Reiss to meet the Obamas in 2011, the dress unsurprisingly sold out everywhere. Kate consistent use of the label has been acknowledged as assisting their mainstream resurgence.
Strathberry
Getty Images On 1 December, while out in Nottingham, Markle wore this handbag by little-known Scottish brand Strathberry. It sold out immediately as expected, and people who already owned the bag have been listing them for almost quadruple the price on eBay.
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