People are zoning in on Meghan Markle's boyfriend shirt

(Image credit: getty)

The Duchess of Sussex took us behind the scenes of her Smart Works fashion line on Instagram Stories the other day, and while we didn't get a glimpse of the actual collection, people were very taken with the shirt she was wearing.

In the videos, Meghan was seen laughing as she waited to surprise women arriving to presumably model and shoot the clothes, though they could've been charity workers too.

The Duchess wore a pair of jeans with her favourite suede Aquazzura heels, and a boyfriend shirt everyone on the internet fell in love with.

It's actually by a British brand called With Nothing Underneath, by ex jewellery editor Pip Durell, who started her own business after she couldn't find the perfect boyfriend-style shirt.

Shop now: LINEN: Sky Blue & White stripe for £85 from WNU

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The £85 shirt is made of 100% cotton and was made as a sustainable wardrobe essential that will stand the test of time', a concept that will resonate with Meghan as she has been championing sustainable fashion.

Naturally, it has been flying off the shelves, though you can pre-order yours now.

The brand wrote on Instagram, 'So incredibly honoured that The Duchess of Sussex chose to wear her WNU linen yesterday in London for a day with the incredible @smartworkscharity . Endlessly effortless and elegant, we are blown away.'

The Duchess, who is the patron of Smart Works, has teamed up with several high street brands to create a line of workwear that will help women in need enter the work force again. It is due to launch in the autumn.

Penny Goldstone

Penny Goldstone is the Digital Fashion Editor at Marie Claire, covering everything from catwalk trends to royal fashion and the latest high street and Instagram must-haves.

Penny grew up in France and studied languages and law at the Sorbonne Nouvelle University in Paris before moving to the UK for her MA in multimedia journalism at Bournemouth University. She moved to the UK permanently and has never looked back (though she does go back regularly to stock up on cheese and wine).

Although she's always loved fashion - she used to create scrapbooks of her favourite trends and looks, including Sienna Miller and Kate Moss' boho phase - her first job was at, sourcing the best deals for everything from restaurants to designer sales.

However she quit after two years to follow her true passion, fashion journalism, and after many years of internships and freelance stints at magazines including Red, Cosmopolitan, Stylist and Good Housekeeping, landed her dream job as the Digital Fashion Editor at Marie Claire UK.

Her favourite part of the job is discovering new brands and meeting designers, and travelling the world to attend events and fashion shows. Seeing her first Chanel runway IRL at Paris Fashion Week was a true pinch-me moment.