Rousteing, 29, created a customised set of jackets for North.
Kardashian took to Instagram to thank Rousteibng for the jackets.
"Baby Balmain!! Thank you so much @olivier_rousteing &@balmainparis for making North these one of a kind jackets!! I'm so honoured that Northie is your little muse! Can't wait for her to wear them!!! (sic)" Kardashian wrote.
Rousteing, who chose Kim and Kanye to star in Balmain's spring/summer 2015 men's campaign, has previously gushed about the adorable child and said he sees the West family as representing a "new world".