I hope I am posting this in the right place. I want to know why some pants really rise up when you sit down and others do not. I know all pants ride up some but some pants really ride up more. When I stand, all the pants are pretty much the same length but I can really feel a difference when I sit. Some feel like they are half way to my knees. What am I feeling? And more importantly, what can I do about it? I have also noticed this with purchased pants but have never been able to figure it out! I don’t want to add length because they would be too long when standing. So what is this?