Was trying to merge two armatures in blender so I could take clothes from one avatar and put it onto another (deleted all extra meshes off the model with desired clothes).
Using CATS it worked and it moved correctly but it was screwed when I tried it out in game, the arms did not correspond to where they should be at all. While having arms resting next to body they would appear to be in front of the characters, it's as if it was offset in some weird way.
All I did to the armature was scale it up a bit and change the resting position on the avatar with the clothes (because target base used T pose, while the other used A pose, so switch A -> T and set is as resting position)
Anyone got an idea what messed up?