Static Cloth Simulation

Alright, I’m sorry If I’m being ultra stupid here, I’m a dumbass, but I already tried every approach I could find so now I need people smarter than me. As the video shows, the cloth simulation is working, but it’s almost completely still. It’s forming wrinkles and it moves a little bit for a second, but it’s static.

At the moment, it’s 100% weighted on spine_05. Previously I tried to only paint weight on the part that should be still, but then the rest of the mesh that wasn’t painted would just transfer that weight to another bone. I tried a LOT of different stuff so can’t remember everything I already tried. The model is from Batman Arkham Knight btw
Would really love if someone could help me out here, cuz I feel like I’m just being stupid.