Just like the normandy crew, if you change one person, like Traynor, all of them are gonna change the outfit too. The game, didnt have everyone with seperate meshes and textures, so if you change one person, that wears that dress, you have to change the whole game of people that wear the dress, in all the pcc files, just changing the texture and the pcc file will not work for something like this, like it would for shepard, who has her own clothes and meshes. I hope this makes sense. They share that mesh and texture with everyone in the game that wears it, so you can only get away with changing them if you find every pcc file with that dress mesh and change it too. even then you might have problems, you might have to make sure that if there are different LOD that you replace them as well on every pcc file. I made a post on LOD earlier, with screenshots for the starting outfit not showing up properly. Hope this helps!