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    1. Fashion

    This Celeb-Loved Aussie Label Will Solve All Your Summer Styling Dilemmas—and It’s Just Launched on Net-A-Porter

    Margot Robbie, Lili Reinhart and Gabrielle Union are all fans

    Lauren Cunningham's avatar
    By Lauren Cunningham
    Published 12 July 2025 In Features

    When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

    SIR the label Australian fashion brand celebs love blue dress red dress crochet dress
    (Image credit: SIR)
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    Just when you think you’re fully up to date with the latest fashion brands all the cool girls are wearing—even the small, summer-ready labels from the other side of the world—another one comes along and suddenly commands all your attention. Such is the life of a fashion editor. The newest name on our radar? SIR, also known as SIR The Label, the Australian brand that’s already attracted an impressive fan base including Margot Robbie, Lily Aldridge, Whitney Port and Gabrielle Union.

    An acronym for “separates, intimates and ready-to-wear,” SIR offers an impressive collection of swimwear, suiting, and what it’s now best known for: beautifully cut dresses.

    Gabrielle Union, Lili Reinhart, Margot Robbie wearing SIR The Label

    Gabrielle Union, Lili Reinhart, Margot Robbie wearing SIR The Label

    (Image credit: Gabrielle Union, Getty Images)

    Although the brand may feel new to me, to many fashion fans and even to Net-a-Porter—marking an exciting business expansion—it actually launched back in 2014, founded by friends Nikki Campbell and Sophie Coote. And despite being a recent addition to Net-a-Porter, searches for SIR have surged by 283% in the past three months alone, proving it’s only gaining momentum. One glance at its chic silhouettes, timeless colour palettes and focus on natural fabrics explains why.

    Now that SIR The Label is firmly in our fashion brand Rolodex, the only question left is: what to add to our wardrobes? Below, discover the chicest SIR dresses, separates and swimwear to shop now.

    Shop SIR The Label

    Fresca Belted Silk Crepe De Chine Maxi Dress

    SIR
    Fresca Belted Silk Crepe De Chine Maxi Dress
    £610
    £610 AT NET-A-PORTER

    This chic belted dress is quite the statement-maker whether styled with a simple flip flop or evening-ready strappy sandal.

    Floral One-Shoulder Silk Satin Top

    SIR
    Floral One-Shoulder Silk Satin Top
    £265
    £265 AT MYTHERESA

    For those who prefer separates, this 100% silk top is sure to become a welcome addition to any wardrobe.

    Illaria Crocheted Cotton Midi Dress

    SIR
    Illaria Crocheted Cotton Midi Dress
    £355
    £355 AT NET-A-PORTER

    Crochet dresses are particularly popular when it comes to summer styling. Layer this one over a bikini for a laidback look or a simple slip for a more modest fit.

    Fiorella Tie-Front Floral-Print Linen Halterneck Midi Dress

    SIR
    Fiorella Tie-Front Floral-Print Linen Halterneck Midi Dress
    £415
    £415 AT NET-A-PORTER

    SIR The Label are no strangers to pared-back colour palettes but they also aren't afraid of a bold print. Here, their tie-front design has a more striking style.

    SIR, Baci Beaded One Piece-Black

    SIR
    Baci Beaded One Piece
    £205
    £205 AT SIR

    SIR's swimwear collection is equal parts polished and practical. The subtle bead detailing on this swimsuit adds a great element of interest.

    Carlotta Tie-Front Linen Halterneck Midi Dress

    SIR
    Carlotta Tie-Front Linen Halterneck Midi Dress
    £385
    £385 AT NET-A-PORTER

    The butter yellow shade trend is still gaining great traction and this linen midi effortlessly leans into the look.

    SIR, Floral Linen Midi Skirt

    SIR
    Floral Linen Midi Skirt
    £240
    £240 AT MYTHERESA

    Whether worn with a classic white shirt or simple tee, this linen midi skirt is sure to liven up any wardrobe.

    SIR The Label, Leone Blazer-Natural

    SIR
    Leone Blazer
    £460
    £460 AT SIR

    Both Margot Robbie and Lili Reinhart have invested in SIR's blazers and it's easy to see why.

    Ruby Open-Back Semi-Sheer Cocktail Dress

    SIR
    Ruby Open-Back Semi-Sheer Cocktail Dress
    £555
    £555 AT MYTHERESA

    For more formal occasions, perhaps this blue open-back semi-sheer frock will catch your eye?

    SIR, Luna Wide Leg Jean-Washed Indigo

    SIR
    Luna Wide Leg Jean-Washed Indigo
    £295
    £295 AT SIR

    Alongside the chic SIR dresses, you'll also find everyday essentials such as these wide-leg jeans.

    SIR, Violet Halterneck Linen Maxi Dress

    SIR
    Violet Halterneck Linen Maxi Dress
    £345
    £345 AT MYTHERESA

    Consider this white linen dress your go-to summer frock for every occasion—except other people's weddings, lest you match the bride.

    Marie Claire Newsletter

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    Lauren Cunningham
    Lauren Cunningham
    Contributor

    Lauren Cunningham is a freelance fashion and beauty editor covering runway reviews, fashion news, shopping galleries and deep-dive features. 

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