[Help] texture goes wrong

[pistol81]

I've been trying to use this mod(https://www.nexusmods.com/metalgearsolidvtpp/mods/726) for the 'Leather Jacket' outfit (the mod's originally for NS Sneaking suit)

Everything went fine but the hipsack texture keeps appearing around neck in the game - screenshot attached

And this doesn't happen when installed for the NS sneaking suit

Mesh for the hipsack's actually bound with legs and the walkie talkie all together when checked the fmdl

 

What should check to fix this?

Any suggestion or solution will be appreciated!