Top glitching when using EUP

So I tried putting my outfit into EUP and changed into it using the menu, but it resulted in my character’s top rigging going bonkers as shown in this pic:
image
This issue will then persist throughout my entire time in the server.

However, upon relog, I tried changing into the same outfit through VMenu, which loaded the clothes fine:
image

the model used is the default firefighter model! but i replaced another default clothing slot with this model, not sure if that would cause an issue.

Change the original textures instead.

unfortunately the original model slot does not have enough textures for my uniforms

so I’ve found out that changing the head will fix the model for my character, but no idea how to go about changing the head from the EUP configuration