Sleeper has just released Princess Diana-inspired loungewear

(Image credit: 1982 Anwar Hussein)

When you think of Princess Diana's iconic style, you probably don't immediately think of loungewear. However, Royals wearing casual clothes isn't as uncommon as you'd think.

The Duchess of Cambridge is a fan of jeans and Superga trainers for her less formal engagements, and Princess Diana also liked a casual ensemble, especially during her Sloane Ranger days, at the beginning of her relationship with Prince Charles.

Back then, she'd often be seen in jeans and boots, paired with an oversized blazer or knitwear layered over shirts with exaggerated collars.

It's this style decade of Diana's that inspired luxury pyjama brand Sleeper - the one behind the iconic feather PJs - to launch the Diana Athpleasure set.

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Diana Athpleasure Sweatsuit with Shorts in Grey, $220 at Sleeper

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SLEEPER Diana Athpleasure cotton-blend jersey sweatshirt and shorts set, £170 at Net-A-Porter

The set 'pays homage to Lady Diana’s iconic, off-duty style' and features cotton shorts, a slightly oversized sweatshirt and a white detachable collar for when you want to jazz things up a bit.

It's available in six different colours, ranging from butter yellow to pastel pink and more traditional black, though I'm in love with this sky blue version, which looks remarkably like the dress Princess Diana wore to the polo when she was pregnant with Prince William in 1982.

Sold.

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 MoneySavingExpert.com, 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.