Idk... I've only used it on one character and that was a while ago. But I don't think it belongs in the forsworn armor.
Just had to say that before having finished reading the title, I thought it was about saviors of some kind that might be hiding somewhere
I'm pretty sure that the Savior's Hide is unique & you can't benefit from the "matched set" perk.
No, you cannot.
There only one piece of this armor so you will benefit from matching perk as it is require you to use the same type armor.
No matching set bonus, but can still have a custom fit bonus as long as the gauntlets, boots and helmet are light armor... so it's not a total loss.