Look for Texture Sets -> any tutorial related to FO3 or Skyrim will show you how to allow you to add new armors with just the re-textures.dds files and not need any new .nifs.
TS's are VERY useful and people really should get used to using them as bloating DL files just so they can say my mod is 500 Megs when it only needed to be 150 or less once you remove all of the needless bloat.nifs.
Rant not directed at you

just in general I already see tons of mods/modders doing this bloating garbage using 50 of the exact same .nif just pointing to different textures when all that is needed are the new Textures and the .nifs can be completely deleted, just so they can pomp around gloating that their mod is <----THIS BIG----> when it only needed to be <-thisbig->...