Not 100% sure, but as far as I've seen with Unity gear, it goes strictly off of the place your Unity is in. Say something is +1~7, and you're in 2nd, you'll get +6. Recast testing with Regal, Refresh amount from pants (2nd place gets 1 Refresh), and +Dex/Agi from Hairpin has followed this as far as I've seen. Doesn't mean they all follow in such a way, but it's not that hard to imagine.