Unfortunately many people are completely unaware that all of the Kardashians from Kim down to Kylie wear some type of hair systems which give instant thickness.
It's possible, as Lea Lea said, to recreate this look on all natural hair (without extensions) but it will take a lot of work, even if your hair is naturally thick and coarse.
I agree that you would need to use volumizing products such as mousses, root lifters and blow drying with a round brush and a concentrator. Set each section you blow dry into big round faux curlers. Unpin each one and then hot iron. Rewrap to cool and set. This will help a lot.
You can also use isolated clip-ins and/or a ratt or hair bump along the crown. Sleeping on rag rollers will also help amp up the volume a lot.