Sienna Miller

David Moir/Reuters; PA Photos /Landov

Sienna Miller and Keira Knightley are both known for their quirky British style — so what happens when you cast them both in the same film? Not only do they become close friends, but apparently they coordinate their red carpet outfits! The stars spent their day promoting The Edge of Love at the Edinburgh Film Festival. First, they hit a photocall in matching booties and black accents. But they hit the nighttime premiere in ’30s-inspired black and white — Sienna in long fringe and a bowler hat, Keira in a Chanel jumpsuit and bolero. We can’t wait to see if the actresses keep up their red carpet team effort. Tell us: What do you think of Sienna and Keira’s paired-up looks?

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Our closets are jam-packed with frocks in pretty much every color of the rainbow–but when in doubt, we always go with a little black dress. And we’re not alone in relying on the style staple. Just about every celeb in Hollywood rocks the LBD from time to time, just like Sienna Miller did in a this lace Monique Lhuillier number for the Film Independent’s Spirit Awards. Click over to our friends at FabSugar for great tips on how to choose the most flattering LBD silhouette—and learn other insider tricks for keeping the classic look fresh and fabulous.

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Scarves couldn’t be hotter for fall — and what better way to add a touch of the wild to any outfit than with a dash of leopard-print? Whether you wear it with neutrals like Keira Knightley, bold colors like Sienna Miller or with dresses like Eva Longoria, this is a can’t miss accessory! Here are a few of our favorites for you to try out. Tell us: Is this a trend you’d try?

Vote on even more star trends by clicking here!

Kashmere Camel Leopard Printed Cashmere Wrap, $135 at bluefly.com

VERA Leopard Crepe De Chine Scarf, $62 at ronherman.com

Echo Leopard Print Scarf, $38 at bloomingdales.com

Animal Multi Purpose Scarf, $9 at asos.com

Forever 21 Leopard Scarf, $7 at forever21.com

BAUER-GRIFFIN

Though we’ve seen lots of stars go dark for roles in the past few months — Jessica Biel and Mischa Barton pop to mind — we had to look twice when Sienna Miller appeared with long brunette hair on the set of her new film Hippie Hippie Shake. She was almost unrecognizable with her wig on! We definitely prefer the British star with her normal blonde bob that highlights her big blue eyes and unique fashion sense, but we want to know what you think. Tell us: Do you like Sienna with brunette hair? Or should she stick to blonde off camera?

CAROLINE TOREM CRAIG/LFI

Looking like she fell out of the 1950’s in a red bodysuit and leopard scarf, Sienna Miller celebrated her clothing line with sister Savannah in an intimate party at Bergdorf Goodman on Wednesday night. And lest you worry that Twenty8Twelve by s. miller is only for willowy stars like Sienna herself, she assures PEOPLE that’s not the case. “Throughout the collection we’ve really covered all different ages, all different body types. It’s really fashionable clothes for all different sorts of confident women.” Speaking of confident women, we had to know if there was any sibling rivalry involved in the design process. Savannah, the older and taller of the sisters, tells PEOPLE that “We both bring something very different to the line, and working together we complement each other. We get along very well. We know each other very well so it’s never a conflict. It’s a really good time to spend time together doing something we both love so it’s great.” Sounds like a perfect match! Shop the collection at my-wardrobe.com.

Jeff Vespa/WireImage; inf; Roger Wong/INF

Vests made a comeback last fall — and from menswear-inspired to open cropped styles, we thought we’d seen them all. But then some fashion-forward stars have come up with a new twist on the wardrobe staple — cropped, multi-colored vests. From Mischa Barton’s all-sequined number to Jessica Simpson’s bright macrame version to Sienna Miller’s metallic patchwork, the trend seems to be taking hold of some pretty stylish women! Besides the cropped length — which is tough for most women to pull off — there is something about these that seems more costume-y than retro-cool. But maybe that’s just us! Tell us: Would you wear these multi-colored vests? Is this a trend you want to try?

Humberto Carreno/startraks

In the August issue of StyleWatch, you can check out stars like Cameron Diaz, Rihanna, Kylie Minogue, and more sporting the latest accessory du jour — glossy handbags. Sienna Miller was recently spotted on her way to the airport carrying this chic Chloe bag — which adds just the right polish to her casual travel outfit. For a classic look, go with darker colors, like black, navy or chocolate brown, or go bold with metallics or bright colors. Below are some of our favorite picks. Tell us: Would you wear a patent leather bag?

Get the Look!
Splurge:
Burberry “Beaton” hobo, $850, nordstrom.com

Michael Michael Kors “Chestertown” satchel, $398, nordstrom.com

Adrienne Vittadini “Norena” Tote, $228, dillards.com

Steal:
“Natasha” patent tote, $50, baghaus.com

Patent tote, $40, gap.com

Zou Zou quilted patent messenger tote, $20, jcpenny.com.

And be sure grab the brand new August issue of StyleWatch, on sale now!