Kate supports British labels Reiss and Emilia Wickstead

The Duchess of Cambridge, née Kate Middleton, championed British design talent once again on a charitable engagement with Action for Addiction. The stylish royal kept cool breezes at bay in a Reiss houndstooth coat on Thursday (Dec. 10) in Wiltshire.

The $670 Rubik coat will no doubt sell out fast as "the Kate effect" comes into play and fans strive to recreate her classically chic winter style.

TAP TO VIEW FULL GALLERYKate wore the $670 Reiss Rubik coat on Thursday.

The duchess is a fan of the retail store and previously donned an electric-blue Reiss coat to the opening ceremony of the Rugby World Cup in September.

Read More: Princess Diana's 15 best winter style moments

Kate paired her coat with black court shoes and an Emilia Wickstead dress, another favourite designer who she and sister Pippa have championed on several occasions. The aquamarine long-sleeved dress with pleated skirt was previously worn by Kate on her royal tour of New Zealand in April 2014.

Kate recycled an Emilia Wickstead dress from 2014.

As patron of Action on Addiction, Kate was in Wiltshire to visit the charity's Centre for Addiction Treatment Studies in Warminster. The duchess has been focusing her autumn engagements on foster care and mental health in young people, but on Thursday's visit she chose to highlight another issue close to her heart – supporting those who struggle with addiction.

The duchess teamed the coat with an Emilia Wickstead dress.

Kate's visit to the centre follows her appearance at the ICAP annual charity day with husband Prince William on Wednesday. The 33-year-old perfected the art of power dressing as she turned trader for the day in a teal L.K. Bennett suit that she had worn once before in 2012.

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