I play with 3d-skin-layers and Emotecraft and 3d layers does not bend with the body when using the emote. This happens on version of 3d-skin-layers 1.6.0 and above, but works fine on 1.5.4 and below. I searched for solve of this problem on Emotecraft repository and found that the problem is only in your mod.

1. Screenshot with 3d-skin-layers 1.6.0 version (broken behavior)
   
2. Screenshot with 3d-skin-layers 1.5.4 version (normal behavior)
   

List of mods:

I also noticed that this bug exists on my other modpack with other mods, but 1.5.4 version of 3d-skin-layers

List of mods:

This is an emotecraft issue and I haven't been able to reach the author for some time. Nothing I can do currently.