Like the overview says, this mod primarily improves the gold trim and numbers for vault suits, without otherwise changing the design. I used ajhakra's gold cube map and an altered diffuse texture to achieve this effect. I also fixed an issue with the male specular texture. Check images for details on the fix, as well as a comparison between the vanilla and tweaked gold trim.

Also as stated in the overview, this comes in 2k and 4k versions. The 2k version is based directly on the vanilla textures, and should be used if you don't use any higher resolution textures for your armor and clothing. The 4k version is based on SavrenX's HD Vanilla Clothes, because I didn't want to download 58 gigabytes of HD Textures DLC. If you want to use 4k textures, install the 2k version first, then overwrite with 4k textures.

DLC vault suits in Far Harbor and Vault-Tec Workshop are covered, but since this mod is made up of loose files, the DLCs aren't a hard requirement to run. It should work if you have the DLCs, and have no effect if you don't.

Vault skeletons are also included, if you're interested in that. They're largely the same, but with the flat yellow trim turned into a dim, blackened amber shade. This doesn't have a gold cubemap effect, so while still not perfectly matching the player-worn vault suits, they'll still match a little better than the vanilla flat yellow color.

Last thing to note is that, like any other mod that changes the gold trim in this way, when it rains the cubemap will be replaced with a standard one, overwriting the new gold cubemap. This can't be fixed, so the bug is 'intended', and you can see how this looks in the images section. However, I made sure that the diffuse texture maintains some of its yellow shade, instead of being pure black, to help downplay this bug.

Update: I've also added an optional file covering the custom FO4 vault suits from Creation Club. Have fun!

Credits
 ajhakra's Cubemaps for the gold effect and SavrenX HD Vanilla Clothes for the basis of the 4k textures.