Well, this is unexpected.

Kate Middleton left the house wearing something other than complete Princess regalia.

The Duchess of Cambridge – who’s pregnant, in case you have been living in Siberia for the past few months – is very, very rarely seen in anything but utter sartorial prim perfection. We’re talking: pencil skirts, twin-sets, kitten heels and pea coats.

So you can imagine our shock when we saw her latest outfit included… a black hoodie.

Yes, she’s made hoodies fashionable.

All black everything. So chic, Kate M. Image via WPA Pool/Getty Images.

Just take a look. She wore that hoodie like no one else could. She has even made us want to dig out our old trackies and take them for a spin around the block. Maybe.

She pulls it off. Scout’s honour. Image via WPA Pool/Getty Images.

The Duchess wore her comfortable attire while visiting a scout colony and teaching the children about disability. She helped the kids ice a cake while wearing a blindfold, and cut some food with a boxing glove on her hand – all to show the scouts that disabled people can complete everyday activities just like anyone else.

Now, back to that hoodie, seeing the pictures not enough? Luckily for you, Clarence House posted a video of her wearing it. (Don’t worry, we watched it three times, too.)

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We’re calling it now: This will be the biggest trend of 2015. Hoodie chic.

Click through the gallery below for more photos of The Duchess.

Kate Middleton in a peach Jenny Packham dress at a children's hospice.

Kate Middleton wearing a $30 ASOS wrap dress while shopping for nursery furniture in Chelsea, London.

Kate Middleton wearing a $76 polka dot Topshop dress.

The Duchess of Cambridge attends The Art Room Reception at the National Portrait Gallery.

Charles, Camilla and Kate at Queen Elizabeth II's annual summer garden party.

Kate in the 'Sophia' dress by Erdem to launch a counseling program at Willows Primary School in Manchester.

Kate Middleton stunning in a bright red Versace coat.

Kate Middleton in a cream-coloured coat at Clare Charity Centre in Saunderton, Buckinghamshire, England.

The Duchess a blue Malene Birger coat at the unveiling of a new subway at London's Baker Street Underground.

At a scout training day dressed in a Barbour coat, blue skinny jeans, Le Chameau Vierzon Nord boots, and a Scouts neckerchief.

Kate Middleton at a Scouts ceremony at Windsor Castle

Kate Middleton in a MaxMara wrap dress

Kate in a brown Hobbs coat

Kate Middleton on the Swiss slopes

Kate Middleton at the BBC Sports Personality of the Year awards ceremony

Kate Middleton at the BBC Sports Personality of the Year awards ceremony

Kate Middleton leaving the hospital

Kate

Kate's hair: Before and after.

Kate's £1,400 silk pleated Mulberry ‘Cabbage’ dress

The Daily Mail compared Kate's hair and dress to Princess Diana's in this photo

Diana's dress was made of emerald green silk chiffon. Memories Of Diana : Departure From Auckland For Eluthera - April 30th 1983 These screen-captures of Princess Diana are taken from an ITN source compilation clip from the royal tour of Australia and New Zealand in 1983. http://www.princess-diana-remembered.com/1/post/2012/06/memories-of-diana-departure-from-auckland-for-eluthera-april-30th-1983.html D

Kate at the opening of Commonwealth Street, Honiara

Kate at the opening of Commonwealth Street, Honiara

Will laying a wreath at the Pride of the Nation memorial to the WWII Scouts and Coastwatchers.