Best Dressed of the Week: Chanel Iman's Slinky Sheath

Plus, must-see looks from Rihanna, Zendaya and others.

Chanel Iman - The supermodel attends an event at W Hotel in NYC wearing an olive satin slip-dress from Alexander Wang and Giuseppe Zanotti black sandals. Simply sexy. By Jazmine A. Ortiz (Photo: Brian Ach/Getty Images for W Hotels Worldwide)

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Chanel Iman - The supermodel attends an event at W Hotel in NYC wearing an olive satin slip-dress from Alexander Wang and Giuseppe Zanotti black sandals. Simply sexy. By Jazmine A. Ortiz (Photo: Brian Ach/Getty Images for W Hotels Worldwide)

Photo By Photo: Brian Ach/Getty Images for W Hotels Worldwide

Kerry Washington - The Scandal star is snapped outside of a private party in Brentwood, California rocking a colorful Suno dress, red Louis Vuitton bag and pumps. (Photo: All Access Photo Group)

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Kerry Washington - The Scandal star is snapped outside of a private party in Brentwood, California rocking a colorful Suno dress, red Louis Vuitton bag and pumps. (Photo: All Access Photo Group)

Lupita Nyong'o - Take notes! This is definitely how fun, summer style is done. The actress hits Disney's D23 expo in this striped confection and complementing white pumps. (Photo: Alberto E. Rodriguez/Getty Images for Disney)

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Lupita Nyong'o - Take notes! This is definitely how fun, summer style is done. The actress hits Disney's D23 expo in this striped confection and complementing white pumps. (Photo: Alberto E. Rodriguez/Getty Images for Disney)

After the Turn Up - Rihanna is casual but fly after leaving Griffin Nightclub in NYC and heading to Coppelia's Diner for some late night grub.(Photo: TS, PacificCoastNews)

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Rihanna - RiRi is spotted getting a bite to eat at Coppelia's in NYC wearing head-to-toe white. And peep the accessories: Dior resort 2016 bag, Vfiles hat and Tom Ford sandals. #fashionkilla. (Photo: TS, PacificCoastNews)

Nicole Murphy - The reality star leaves Nice Guy in West Hollywood feeling flirty in a floral frock. Cay-ute!(Photo: All Access Photo Group)

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Nicole Murphy - The reality star leaves Nice Guy in West Hollywood feeling flirty in a floral frock. Cay-ute!(Photo: All Access Photo Group)

Photo By Photo: All Access Photo Group

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Zendaya - The fashionista shows off her new shoe line, Sole of Daya, at Magic Convention in Las Vegas looking every bit the businesswoman. (Photo: DJDM/WENN.com)

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Zendaya - The fashionista shows off her new shoe line, Sole of Daya, at Magic Convention in Las Vegas looking every bit the businesswoman. (Photo: DJDM/WENN.com)

Gabrielle Union - Mrs. D-Wade parties in West Hollywood at the Samsung Galaxy launch event in a hot-white pants set. Love this look, plus her face is #beat. (Photo: Alberto E. Rodriguez/Getty Images)

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Gabrielle Union - Mrs. D-Wade parties in West Hollywood at the Samsung Galaxy launch event in a hot-white pants set. Love this look, plus her face is #beat. (Photo: Alberto E. Rodriguez/Getty Images)

Fierce and Fiery - Laverne Cox strikes a pose inside an after-party for the screening of Grandma hosted by The Cinema Society, Kate Spade and Ketel One Vodka at The Jimmy at the James Hotel in New York City. (Photo: Stephen Lovekin/Getty Images)

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Laverne Cox - The OITNB actress wows at the after-party for a screening of Sony’s Grandma in a floor-length stunner. The style and silhouette are perfection. (Photo: Stephen Lovekin/Getty Images)

Photo By Photo: Stephen Lovekin/Getty Images

Kylie Jenner - King Kylie continues her 18th birthday takeover in Montreal in a Nicolas Jebran multicolored mini dress and Dior shades. (Photo: Raffi Kirdi/Getty Images for INLIST)

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Kylie Jenner - King Kylie continues her 18th birthday takeover in Montreal in a Nicolas Jebran multicolored mini dress and Dior shades. (Photo: Raffi Kirdi/Getty Images for INLIST)

Photo By Photo: Raffi Kirdi/Getty Images for INLIST

Hannah Bronfman - To DJ the StyleWatch x Revolve Fall Fashion Party in New York City, Hannah wears a floral one-shoulder bustier and full skirt from the Sophie Theallet Resort 2016 collection. (Photo: Neilson Barnard/Getty Images for People StyleWatch)

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Hannah Bronfman - To DJ the StyleWatch x Revolve Fall Fashion Party in New York City, Hannah wears a floral one-shoulder bustier and full skirt from the Sophie Theallet Resort 2016 collection. (Photo: Neilson Barnard/Getty Images for People StyleWatch)