How do I sag my jeans? Please help me now!!!?

Ok so I want to sag my jeans just a little bit, maybe like 2 inches or where the waist band shows! I don't want to sag where my butt is showing! So how do I? I want to do this with my jeans. I've tried sagging then but, I don't know how when I do my pants just go back up when ever I bend down or sit! So remember I want to sag my jeans just a little bit like 2 inches, but I don't know how, help! Please answer my question right, please don't say don't sag or something like that because I'm not asking if I should sag or not!!! Ok that's it.