That's not an extra layer they added: it looks like LOD that doesn't go away or something. The texture on that bugged area's lower res and somewhat enlarged, so it's DEFINITELY a bug an not an addition to the uniform. It should be fixed ASAP, IMO, TYVM.
I don't think it's a "bug" so much as an "error". It was introduced during the same patch as the Romulan Veteran jackets, one of which looks a lot like a modified version of Republic Uniform 1. What I suspect happened was they started with that uniform as a base, then accidentally saved a change or two to the model without realizing.