How to fix the armor texture problem when they come from a mod

im having the same problem and its happening with almost every armor set in my modpack except for the armor from immersive engineering for some reason and armor doesn't have a configurable weight value either heres some screenshots:
psimetal

red dragon scale

steel

mekasuit

Are you saying about custom armor?

How to fix the armor texture problem when they come from a mod

Are you seeing this problem on new versions of the mod ?
If yes,i dont have idea.
But if no,i recommend you to try newest versions of the mod.

the custom armors will be broken cause I only made a animated model that compatible with vanilla armor model. to solve this problem, I have to make animated model for whole custom armors but it's gonna very difficult.

This is similar issue with mo' bends mod which adds new animation for minecraft just like mine.

ok
in fact it would be limit impossible and even if you would make its compatible with certain mods but there will still be too much has developed