In a Snapchat after the show, the mother of two shared that Balmain designer Olivier Rousteing took the unique piece specifically off the runway just for her.
And she also got candid about her "challenge of the day."
"Underwear or no underwear?" she said on Snapchat, flaunting her slimmed-down figure.
Not to be outdone by her younger sister, 37-year-old Kourtney showed off her killer legs in a show-stopping gold pantsless look.
The pair was seated next to their mother, Kris Jenner, at the show -- who herself looked fierce in a pair of thigh-high leather boots -- as well as former editor-in-chief of Vogue Paris, Carine Roitfeld.
The Kardashian family has been notably close to 30-year-old Rousteing for years. Kim and her husband, Kanye West, starred in a steamy Balmain campaign in 2014, and even their 3-year-old daughter, North, is a big fan.
It's good to see Kim brush off her scary incident on Thursday, when known prankster Vitalii Sediuk attempted to attack the reality star from behind as she was exiting a black car and making her way into L'Avenue restaurant in Paris. Sediuk is the same man who went after Gigi Hadid in Milan, Italy, just last week, wrapping his arms around her and lifting her up.
Watch Kim's security take Sediuk down in the video below: