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For the opening of the Victorian Giants exhibition at the National Portrait Gallery, the Duchess made a case for wintry florals in a Orla Kiely midi dress.
The Duchess paired a cobalt blue Goat coat with a clutch by Beulah London - two of her favourite brands - for the opening of the Action On Addiction Community Treatment Centre in Essex.
The Duchess opted for a military-style Dolce and Gabbana coat in a stylish plum hue on a trip to Oslo. She paired it with her trusty opaques and black suede courts.
The Duke and Duchess of Cambridge were visiting a school in Norway earlier this month.
While in Norway, the Duchess wore a bright orange padded jacket and a cream pom pom hat while on the slopes.
The Duchess opted for a blue printed velvet dress by Erdem for a reception in Sweden during their Royal Visit.
For a service at Westminster Abbey in March 2015, Kate wore a baby pink Alexander McQueen coat with pearl buttons.
The Duchess wore the same McQueen coat to Trooping of the Colour in 2013, when she was pregnant with her first child, Prince George.
Don't miss: inside the Duchess of Cambridge's enviable jewellery collection
Here's the Duchess in April 2013, wearing a Tara Jarmon coat to visit a Hospice whilst pregnant with Prince George.
This green tweed Mulberry coat was another stylish, polished choice in April 2013.
The Duchess accessorised this statement animal print dress from Hobbs with a black Mulberry clutch in March 2015, when she was expecting Princess Charlotte.
The Duchess commissioned another of her favourite designers, Emilia Wickstead, to make a maternity-ready coat for her in May 2013.
Emilia Wickstead also cut this dress for the Duchess, as she attended an event at the National Portrait Gallery in April 2013.
At the wedding of William van Cutsem and Rosie Ruck Keene in May 2013, the Duchess wore a polka dot Topshop dress.
Here's Kate wearing the same snow leopard print Hobbs dress back in 2013, when she was pregnant with Prince George.
When she was eight months pregnant with Princess Charlotte, the Duchess wore this new Catherine Walker coat.
One of Kate's favourite maternity pieces is this A-line Mulberry coat, a possible sign that she likes to emphasise her bump in stand-out colours.
See more of the Duchess of Cambridge's best ever fashion moments...