Hey Guys, I'm on vacation, so I'm not on my "Modder and other RL life stuff" Pc right now, and won't be until the first week of February...
But, from my experience, and since I work mostly from GUTS, the Texture Replace line should be on the Item Unit file, not one the wardrobe file, I really don't know what really can be done on the Wardrobe file since that is not something you can edit in GUTS as far as I know.
So you would only have one entry in the wardrobe file for your armour set, but every time you use it in a unit you can use the texture replace in the Unit file.
Edit: By the way, when I'm back from vacation I'll give you all a really cool something for all hehe
Hey Anarch thx for replying even on vacation!
Hope its a great one for you!
No problem Phanjam, I wanted to give a hand before all my communitations are cut, I'm going on a Roadtrip so won't touch a PC on a while. So I won't know what great stuff will start cooking around here.

So hope you get the Texture replace to work on the armours.
PS: A hint about the cool something, It will help more people make cool stuff.
PS: A hint about the cool something, It will help more people make cool stuff. 
O ho! It sounds great already! Cant wait to find out