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War costume designer Matthew Price says he and Sienna Miller worked to distinguish the actor from Carla Duval, a famous British actor whose public profile resembles Miller’s. Their approach combined archive designer pieces with contemporary clothing, including a paisley Chloé jacket Price identifies as Carla’s revenge outfit in episode two. Price also said the wardrobe team had to conceal Miller’s pregnancy while keeping the character’s look consistent.

Costume designer Matthew Price says he and Sienna Miller deliberately shaped Carla Duval’s wardrobe to distinguish the fictional actor from Miller, who plays her in HBO’s divorce drama War. In an interview with ELLE, Price described balancing the character’s resemblance to Miller’s public image with archive fashion, contemporary pieces and practical needs on set.

Carla is a British, Hollywood-famous actor whose divorce from tech executive Morgan, played by Dominic West, drives the series’ story. That overlap with Miller’s own career made the costume work feel “a bit meta,” Price told ELLE. He said he and Miller agreed early on to draw on French minimalism, using magazine editor Claire Thomson-Jonville as a reference, without locking Carla into one silhouette.

The team tested clothing from labels associated with Miller, but some pieces felt too closely identified with the actor. Price recalled trying Chloé items that he and Miller independently agreed felt “a little too Sienna.” That helped them establish a clearer direction for Carla. The wardrobe combines archive designer garments—including Dolce & Gabbana suits, a Comme des Garçons gown and a 2000s McQueen coat—with contemporary pieces from brands such as & Other Stories, The Frankie Shop and Agolde.

Price said the goal was to make the clothing feel expressive but not inaccessible or like a parade of costumes. The show’s designers also had to source archive pieces from collectors and fashion specialists, sometimes borrowing and sometimes buying them. In addition, Price said Miller was pregnant during production, requiring the team to conceal that while dressing her in ways that remained true to Carla.

At a glance
reportWhen: Interview published in 2026; War is des…
The developmentAn ELLE interview with War costume designer Matthew Price details how he and Sienna Miller built Carla Duval’s wardrobe to separate the character from the actor.

How Carla’s Wardrobe Builds Character

The wardrobe gives the series a way to show Carla’s identity and changing circumstances without relying on a single signature look. Price said the team considered whether archive clothes should appear naturalistic or more conspicuous, and shaped the choices around the character’s taste as the story progresses. In a drama about a high-profile divorce, clothing can signal status, self-presentation and shifts in control.

One example Price identified is Carla’s revenge look in episode two: a paisley Chloé jacket with black leather boots. He described it as a less overt choice than a tight dress or a mannish suit. The interview explains how costume decisions contributed to Carla’s portrayal and how the team worked to avoid reproducing Miller’s personal style.

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The Fashion References Behind Carla

War was created by George Kay, the writer of Killing Eve, and is described in ELLE’s report as an HBO divorce drama. Its central relationship is between Carla and Morgan, whose separation supplies the plot. Carla’s fame and interest in fashion make her clothing prominent in the story, while also raising the possibility that viewers could associate it with Miller’s personal wardrobe.

Price said he and Miller discussed references from their first Zoom meeting, including Claire Thomson-Jonville’s approach to French minimalism. The team used archive selections alongside current labels to include a range of price points. Price also singled out a fringed Comme des Garçons gown worn around a later court scene, saying he had considered whether it might be too theatrical before deciding to use it.

“As she is played by an actor such as Sienna, it is a bit meta.”

— Matthew Price, costume designer, speaking to ELLE

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What the Interview Leaves Unspecified

ELLE’s interview does not identify every garment by episode or provide a complete wardrobe breakdown. It also does not specify which archive pieces were loaned and which were bought, or give details of the production methods used to conceal Miller’s pregnancy. Price’s comments describe the creative process; they do not establish how viewers or critics have responded to the costumes.

The supplied report identifies War as HBO’s new drama but gives no release date, episode schedule or further production information. Those details are not established by the interview material.

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The Wardrobe as Episodes Unfold

Viewers can see how Carla’s clothing choices develop as War’s divorce story progresses, including the episode-two outfit Price identifies as her revenge look and the later court-scene appearance in the fringed Comme des Garçons gown. The interview does not announce additional costume details or a forthcoming production milestone, so further specifics would depend on later episodes or statements from the show’s team.

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Key Questions

What is the news about Sienna Miller and War?

Costume designer Matthew Price explained to ELLE how he and Miller created a wardrobe for Carla Duval that would not feel like a direct copy of Miller’s own style.

Who is Carla Duval?

Carla is a British, Hollywood-famous actor in War. Her divorce from Morgan, a tech executive played by Dominic West, shapes the drama’s plot.

What is Carla’s revenge outfit?

Price identified a paisley Chloé jacket and black leather boots in episode two as Carla’s revenge outfit. He said the look was intended to be less obvious than a tight dress or a mannish suit.

Which designers feature in Carla’s wardrobe?

Price cited archive pieces from Dolce & Gabbana, Comme des Garçons and McQueen, alongside contemporary clothing from labels including Chloé, Fendi, Stella McCartney, & Other Stories, The Frankie Shop and Agolde.

What practical challenge did the costume team face?

Price said the team had to conceal Miller’s pregnancy while keeping Carla’s clothing appropriate to the character. The interview does not explain the specific techniques used.

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