Assalamu alaiku warahmathullah. Some scholors says that skinny and lowais pants are haram but no proof for this. I asking u is it allow ?
If by skinny pants you meant tight fitting pants then it is not allowed because it would reveal the shape of your body. It is equivalent of nudity because even when you are wearing tight fitting clothes, the shape of your private body parts is still visible.
The reason why low waist would be prohibited is also for the same reason. If your buttocks are showing because the pants are too low then it would not fulfill the basic purpose of dress and thus it would be Haram to wear such garments.
And Allah knows best.
Mufti Ikram ul Haq
Fatwa Center of America