Teen girls...lol, how do you...?

In school today (I am fourteen btw) and I noticed that the pair of dark wash laguna skinny jeans from hollister I was wearing kept sliding down. So I kept having to pinch the waistband and pull really hard to get them to move an inch. And when I was sitting, I had to sink down a bit, arch my back, and pull as hard as I could, but no luck. My question is kind of an interesting one just for fun: How do you pull your jeans up (hollister, especially) when there fallinnnn? And I've already tried wearing a belt...so don't bother pointin' that outtt...