Up more support needed

I ordered the pants in 2 sizes. She hugs the leg and is for the slightly thicker leg is not really optimal (liverwurst effect).
But for the sitting area around the hips quite loose, even with the smaller size. For sporting activities which is quite inappropriate in my opinion, because you have to have the feeling all the time that they could slide down. Very bad! I have both sizes sent back.
The material and processing but it is really good.