This extends off the screen, as her latest outing has proven. Whilst out running errands in Los Angeles, the actress stepped out in a timeless formula that’s been well documented to be a favourite of French women across every age.

Indeed, the star stepped out in a Breton stripe top, denim shorts and black Mary Janes, showcasing that the key to looking both elevated and unfussy relies upon a rotation of well-edited wardrobe basics.

What piqued my interest most, however, wasn’t the fact that this silhouette consisted of cardinal pieces owned by any chic Parisian, but rather the way in which Marinière tops have reentered the sartorial landscape.

A favourite of Lee Radziwill, Jane Birkin and Alexa Chung, the simple stripe trend has seemed to regain its status as a cult purchase after years of being overlooked in favour of ditsy floral blouses and polka-dot halter-necks.

Earlier this year, Julianne Moore also showed off the sophisticated simplicity of the style by wearing one during the Cannes Film Festival. On that occasion, the actress paired a blue-and-black style from Matteau with black tailored trousers, white flats and a woven leather bag from Bottega Veneta.

Imbued with a sense of Rivera glamour, these striped tops serve as the blueprint for daytime refinement and ease, injecting a sun-kissed sensation into any ensemble they feature in. Truly, you can not wear one without feeling like you’ve come back from the Côte d'Azur à la Brigitte Bardot.

Plus, with this style becoming a core part of how stylish over-50s dress, it’s an investment you can bank on maturing with you. For styles you’ll reach for season after season, scroll below to shop Naomi Watts’s outfit for yourself.

Shop Naomi Watts's Breton Top, Denim Shorts and Mary Janes:

Though the stunning blonde besties look similar enough to be twin sisters, they are, in fact, family (Williams and Watts’ brother have one child together). Williams’ Instagram boasts amazing behind-the-scene snaps of Watts getting ready for red carpet events and shots of the two of them striking Vogue-worthy poses all over the globe.

The gorgeous redhead and the woman responsible for landing her on best-dressed lists travel together constantly, with Stewart sharing goofy photos of Chastain getting glammed up for awards shows, events, and editorial spreads. The actress, in turn, recently shared a birthday pic for Stewart reading, "To the most stylish lady out there @elizabethstewart1 #loveyou.” Aww.

A longtime bestie of Kim, Rose has styled nearly every member of the Kardashian family at some point and was one of the honored invited guests at Kimye’s wedding.

Friends for years, Perry and Wujek don’t shy away from professing their undying love for one another, in both the professional and personal realm. Wujek shares #tbt photos with the singer, and a recent Instagram post by Perry dedicated to her bestie read, "To one of my favourite people in the universe @jwujek! You are one of the most loyal, selfless, optimistic, incredibly creative people I know. We are always challenging ourselves and coming up with the craziest/coolest/chicest lewks... And we ALWAYS have fun even if we lose our minds in the process! Thank you for you, I love you.” Tearing up yet?

As perennial travel partners for work and events, Alba frequently shares photos of herself cheesing out with the powerful styling duo, on and off the job. Check their personal Instagram for behind-the-scenes selfies and sweet moments with the chic mum of two.

How do you know if someone is really best friends with a celebrity? If the celeb named them in their ALS Ice Bucket Challenge, of course! Aside from tagging her mega-stylist in her viral video, Huntington-Whiteley frequently hangs out with Coulter in real life, and the two even attended Coachella together. Coulter, for her part, posts covetable outfit snaps of the breathtaking model that you won’t see anywhere else. 

Hanging at the M Missoni Is For Music party in NYC. 

On Erin:

M Missoni Fitted Hibiscus Dress ($718)

Alternatives:

RVN Aztec Jacquard Dress ($257)

kate spade new york Pointed Toe Pumps ($298)

Spotted out running errands. 

On Naomi:

Banana Republic Issa London dress

Stella McCartney Linda Wedge Sandals ($394)

Balenciaga Arena Giant Town Bag ($1795)

Alternatives:

BCBGMaxazria Greer Printed Wrap Dress ($107)

Rebecca Minkoff M.A.B. Mini Bag ($395)

Franco Sarto Raina Wedge ($67) in Bright Yellow

On the red carpet at The CW and Showtime TCA Party.

On Rachel:

3.1 Phillip Lim dress from the Holiday 13 collection

Brian Atwood pumps

Alternatives:

French Connection Aloha Spring Sequin Dress ($358)

Aldo Bowlick Pumps (80) in Silver

Spotted outside a spa in West Hollywood. 

On Rosie:

Isabel Marant Maryloe Mankolam Dress ($840)

Jacquie Aiche jewellery

Chloe sandals

Alternatives:

Tolani Oksana Dress ($151) in Fuchsia/Orange

Nanni Belt ($141)

Jeffrey Campbell Foxtrot Sandal ($110)

At the Baby Buggy Summer Dinner in East Hampton. 

On Hilary:

Rag & Bone Adeline Jumpsuit ($595, available October)

Jimmy Choo Candy Clutch ($725)

K. Jacques Epicure Sandals ($277)

Alternatives:

Diane Von Furstenburg Shany Jumpsuit ($573)

Kate Landry Social Metallic Mesh Box Frame Clutch ($55)

Joes’ Jeans Keller Sandals ($100)

Leaving her hotel in NYC. 

On Emma:

Garett Leight Louella Sunglasses ($285) in Taupe

Roksanda Ilincic top

Sachin + Babi skirt

Liv Haley earrings

Alternatives:

Zara Cropped Top ($70) in Black

Ted Baker Oil Painting Printed Skirt ($225) in Black

ZiGigirl Adorable Sandal ($50) in White Faux

Spotted out in NYC.

On Olivia:

Westward \\ Leaning No. 11 Children of California Sunglasses ($180)

7 For All Mankind Destroyed Denim Shirt ($158)

MSGM shorts

Louis Vuitton SC Bag ($4850) in Jasper

Pretty Ballerinas Marilyn Flowery Textile Flats ($199)

Alternatives:

Joe Fresh Print Soft Shorts ($17) in Coral

Mango Metal Appliques Skinny Belt ($30) in Black

Express Hinged Plate Satchel ($42)

Monika Chiang Foil Skinny Jeans ($245) in Silver

Jamie Wolf Diamond Edge Bisou Earrings ($4990)

Melina Maria Celia Necklace ($720, 323.937.4591)

Christian Louboutin slingbacks

Alternatives:

Topshop Ponte Jet Pocket Blazer ($70)

Vince Zip Placket Georgette Top ($285)

7 For All Mankind The Skinny Grey Glitter Jeans ($198)

Tory Burch Robinson Midday Satchel ($495)

Sam Edelman Orly Patent Pumps ($120)