Hey, I'll copy message I sent you here just in case someone else finds this useful.
This technique is based on @Keldryn 's approach from: http://forum.orkframework.com/discussion/comment/26780/#Comment_26780
Basically the way you do it is you equip empty gameobject on a character and this gameobject has a script, once it's spawned it will apply armor to character.
For example this is a script where I apply armor. It's put on empty gameobject which is set as a prefab for ORK's armor.
https://pastebin.com/n8siMRgc
Now you need Three more scripts to use this.
One is a scriptable object I use to create collection of UMA Recipes, so you can for example equip multi part clothes on character.
https://pastebin.com/sRawdVys
Two other scrips are needed so you can create Uma Recipe Collection from unity asset menu. You need to create a folder called "Editor" and put these scrips in there.
https://pastebin.com/f3gNDmHK
https://pastebin.com/dnyc2Ajw
After you do this you can right click anywhere in project window and select Create/Animmal/WardrobeClothingSet
this will create object where you can assign UMA recipes.

One thing to note, this script differentiates between male/female races only and it needs female race to have word "female" in the race name. If you have more races or different setup you might need to modify the script.