You should have enough equipment for your entire Winter Rose Garden squad (I only have 13, of which five are 2 star girls - 3 of them L5/6 dupes), even if it isn't maxed/event gear.

My duped 2 star girls are wearing level 8-9 rings (upgraded once for 180 gold to be later fed into another item when I have 10 of them). The non-duped 2 star girls are only level 20 but have 4 slots so have full gear.