If you equip a piece of legendary armour onto a companion, do they get the benefits from that armour that you would normally get? Or would it just be a standard piece of armour to them? For example, I have a Combat Armor Right Leg that provides 15% less damage taken from humans. If I gave that to Piper, would she gain that benefit?
After some digging on Reddit with folks asking the same question, I found that your Companions DO benefit from most legendary armor effects. I need to emphasize MOST though as they obviously do not benefit from increased AP / VATS hit chance ect... they also do not benefit from (+) Resistance benefits. You can also upgrade companions armor with deep pockets and equip legendary gear with strength to increase their carrying capacities by a LOT (Paladin Danse or Strong could essentially be your pack mule slaves). I hope this info helped out!