The gear is Bound to Account and I've seen level 10 versions as well as the level 80. So, why not make that gear true alt gear? Meaning, make it level with an alt level 10-80. No 85 can use the level 80 version unless it has really bad gear, and it's BtA, so it has to be made for alts.

What would also be nice, is if each set gave +% to exp gained from completing quests and/or killing monsters. But, that's just a secondary suggestion, the main suggestion is the levelling gear.