Why do yoga pants go into some girls butt cracks?

Anonymous
What I mean I notice a lot of these yoga pants girls ass cracks eat the yoga pants. You can see the separation of each cheek. I never look like that in yoga pants and my butt is no where near flat or saggy. It has a nice size and shape I just don't get the butt cheek separation, not that I want it I'm only curious. A few examples to illustrate my point. Like this:
yoga pants look on the butt
yoga pants look on the butt
How is that look being achieved? Why don't my yoga pants go into my crack too? It looks like painted on fabric.
Why do yoga pants go into some girls butt cracks?
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