Frost badge gear. More sockets, stamina, and armor than t10 even at ilvl 277 (hardmode) versions of the tier set.
That leaves you to fill the legs, boots (craftables until hardmode), helm (t10 at ilvl 264+), rings, neck, trinkets, and weapon slots.
The last four there are generally where you gear-swap depending on the encounter, so I won't list things for them. Needless to say, however, the priorities are almost always stam, armor, threat stats to soft cap, and then avoidance (in that order).