Summary: There are more items with cloth physics issues however, at this time, I've got a footage of one of the Imperial shoulder pieces that has its cloth physics disabled when the player has a shield on his back, and works fine otherwise as seen in the video below. This affects both SP and MP.
How to Reproduce: For the shoulder armor showcased in the video below, move around with and without a shield on your back.
Media (Screenshots & Video):
How to Reproduce: For the shoulder armor showcased in the video below, move around with and without a shield on your back.
Media (Screenshots & Video):