My trousers/pants keep clipping with my overcoat, its been driving me mad for 2 weeks

[EmHaychThePirate]

my trousers/pants keep clipping with my overcoat, its been driving me mad for 2 weeks, i feel im going crazy. here is a download for the blend file, https://drive.google.com/file/d/1FggfaYD07FWQ6bMSHZridpiQMhoqQdsm/view?usp=sharing

here is a video of the problem

[G_De]

Your coat doesn’t have edge loops to deform. If you add loops and reweight, it really helps with the problem. This is autoweights, no touch up.

Color of the coat changed for clarity.