These Sister Duos Deserve Your Attention — and a Halloween Costume

Kate would be wearing a sophisticated body-hugging dress and fascinator, while Pippa might have on something a touch more casual. Think: a breezy dress and neutral coat.

See more of Pippa and Kate's style here.

Kate would absolutely be wearing something leopard print or a shaggy jacket and Mary-Janes. Meanwhile, Lottie has more of a feminine look about her outfits.

You'll need to swathe yourself in luxe-looking black fabrics that fall to the floor, and definitely hold onto a satin clutch. Spindly earrings are a thoughtful touch, but the bonus is you can wear smart loafers.

See more of Mary-Kate and Ashley Olsen's style here.

Gigi and Bella are most easily recognized in their leggings and crop tops, though Bella's graduated to track pants as of late. Throw on your shades, bombers, designer bags, and don't forget your sneakers.

See more of Bella and Gigi Hadid's style here.

Poppy is always wearing something flirty, or else more romantic and fun. Cara's aesthetic is sporty through and through. When she's not on the red carpet, you'll find her in sweats, high-tops, and a few unexpected accessories, like a bandana.

When these suave actresses make an appearance, Rooney's almost always in a dark number with a plunging neckline, whereas Kate goes for a lighter, girlier design.

Though both girls go for sexy on a night out, Kendall prefers asymmetrical silhouettes and caged sandals that help her achieve a leggy look. Meanwhile, Kylie channels her sporty vibes in pants and strappy heels. She almost always finishes with a textured coat.

See more of Kendall and Kylie's style and fashion line here.

Immy definitely maintains the most laid-back look of the two Waterhouse sisters. While you can find her in sporty rompers and sneakers, Suki jazzes everything up, playing with texture and volume.

Solange's outfits are loud as can be. She plays with color, geometric shapes, and often looks like a walking work of art. Meanwhile, Beyoncé's best ensembles were maid for the performer. They're sexy, but they can be modest and ultraflattering too.

Elle and Dakota each have their own playful style. Dakota almost always chooses minis that shine, so she can wear them with metallic sandals and sophisticated clutches. Her younger sister Elle likes to feel like a princess. One night that means sequins from head to toe, and the next she'll rock an embroidered ballgown.

See more of Dakota and Elle Fanning's style here.