Firecracker is right. It doesn't matter what the source is if it inspires you.
I pin outfit ensembles from all over the internet. Sometimes I pin them because they are just beautiful. I know I may never have the opportunity to dress that way, but the beauty of it makes me happy.
My favorite pins are those I use for personal inspiration. It can be an interesting silhouette or color combination. I try to duplicate it in real life. I am really happy when I successfully duplicate a favorite pin.
Kendall does have very intriguing style. It appears to be easy and effortless, yet interesting and elegant. You found a great inspiration.
I tried to open the marieclarie link you posted, but was unsuccessful. I'll watch for it to appear in other places. Perhaps I'll pin some of her outfits as well.
