The 33-year-old socialite said it was not a new thing for her family as she also used to share her clothes with Kourtney, reported E!Online.
"Kourt saves everything and gives it to me! We always share clothing as sisters so it's fun for our daughters to do the same," Kim posted during a Twitter chat.
The Kardashian sisters are currently promoting their new kids collection.
Kim feels that it is very different from the other things that they have designed.